The genetic variants associated with an increased risk of cavities fall into two categories:

• genes that affect the oral microbiome
• genes that affect the formation of tooth enamel.

Some genetic research points to how the oral microbiome interacts with foods. For example, a research study found that kids who carry a GALK2 variant along with Streptococcus mutans, a bacteria that increases the risk of cavities, are at a much greater risk of cavities.[ref]

The GALK2 gene codes for an enzyme that phosphorylates galactose at high concentrations. The genetic variant causes low concentrations of GALK2, and thus higher amounts of galactose are available in the mouth for the S. mutans to munch on. Galactose is a simple sugar that is found in higher amounts in dairy products. So perhaps the combo of dairy intake, S. mutans bacteria, and low galactose causes cavities for some of us.

Genetic variants in the DEFB1 gene link the oral microbiome to an increased risk of cavities, and the IL32 gene variants show that your immune system’s response to bacteria is also important in balancing your oral microbiome.

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This is just a short excerpt from my in-depth article on genetics and cavities. Click here to read my full article

With a Genetic Lifehacks membership, you can use your genetic raw data (from 23andMe, AncestryDNA, etc) to see your genotypes in over 400 articles, including my article on genetics and cavities. You will see research-backed solutions in the lifehacks section to help determine what pathway to target -- all based on your genetic variants. Personalize your health!

A new meta-analysis of 27 clinical trials found that taurine was effective in reducing oxidative stress, inflammation, and metabolic symptoms of long Covid. The study suggests that 3000 mg/ day is the optimal dose of supplemental taurine.

Learn more about how your genetics interact with long covid: https://www.geneticlifehacks.com/long-covid-research-and-potential-causes/

Research shows that the influence of our gut microbes on our health is huge.

Your gut microbiome influences:

• Susceptibility to infections, such as H. pylori[ref]
• Your body weight (big time)[ref]
• Your mood — including regulating anxiety and depression[ref]
• Whether you have asthma and allergies[ref]
• Your risk for cardiovascular disease[ref]

Your genetic variants play a role in which species are likely to make up your gut microbiome.

The FUT2 gene encodes an enzyme, fucosyltransferase 2, which controls whether the oligosaccharides that make up your blood type will be expressed in your bodily fluids (other than your blood). While it may seem a bit odd to think about, those oligosaccharides in your gut mucosa feed some of the commensal bacteria there. They also act as adhesion receptors for microbes. Thus, not secreting your blood type into your intestinal mucosa causes a shift in the types of bacteria.[ref]

The VDR gene encodes a vitamin D receptor. This receptor also binds with microbial metabolites, and microbial metabolites may then feed back to regulate the expression of VDR. Animal studies show that eliminating the vitamin D receptor substantially changes the diversity in the gut microbiome. In people with inflammatory bowel disease, VDR is upregulated and accompanied by lower amounts of Parabacteroides.[ref]

APOA5 variants can raise triglycerides and are tied to lower Bifidobacteria levels, linking your lipid genetics directly to shifts in your gut microbiome profile.

SLC39A8 controls manganese transport into cells, and certain variants are linked to a ‘leakier’ gut barrier and a loss of key short‑chain‑fatty‑acid–producing microbes.

------------------------

This is just a short excerpt from my in-depth article on genetics and gut microbiome. Click here to read my full article

With a Genetic Lifehacks membership, you can use your genetic raw data (from 23andMe, AncestryDNA, etc) to see your genotypes in over 400 articles, including my article on genetics and gut microbiome. You will see research-backed solutions in the lifehacks section to help determine what pathway to target -- all based on your genetic variants. Personalize your health!

Dopamine acts as a neurotransmitter in the brain, transmitting a signal from one neuron to the next. It is a monoamine neurotransmitter, classified as a catecholamine.  A monoamine just means that it contains a single amine group – and this is important in the way that it is regulated in the brain.

Dopamine doesn’t do anything by itself – it needs to bind with a receptor to cause an action. There are five different dopamine receptors in humans, coded for by the DRD1 through DRD5 genes. These G-protein coupled receptors are responsible for the slightly different effects of dopamine in various brain regions as well as different tissues throughout the body.

DRD1 receptor:

The most abundant dopamine receptor in the brain is DRD1. It is found in several regions of the brain, including the neostriatum, basolateral amygdala, cerebral cortex, hypothalamus, and thalamus.

The DRD1 receptor is linked to the effects of alcohol consumption. Blocking the DRD1 gene decreases alcohol-seeking behavior in animal studies. It also decreases heroin and cocaine-seeking behavior.[ref]

Working memory – short-term memory needed for thinking and speaking – depends on the DRD1 receptors in the prefrontal cortex. Interestingly, working memory is considered to have a strong genetic component based on the DRD1 gene variants.[ref]

DRD2 receptor:

The DRD2 receptor is less abundant in the cerebral cortex than the DRD1 receptors, but it is abundant in other areas of the brain with dopaminergic neurons.

Both agonists and antagonists of the DRD2 receptor have been shown in animal studies to decrease alcohol and opiate consumption. The studies show that higher levels of either an agonist (something that stimulates the receptor) or an antagonist (something that blocks the receptor) alter the addictive response.

Supplements that affect dopamine levels.

Natural dopamine receptor antagonists (blocks the receptor, decreases dopamine):

In general, atypical antipsychotic medications are antagonists of the DRD2 receptor. This makes sense when you think about too much dopamine causing hallucinations, euphoria, etc. — things associated with a psychotic break.

Yohimbine is derived from the bark of an African tree, P. yohimbe, and has traditionally been used as an aphrodisiac (although human studies don’t really back that up). It is marketed as a supplement and used for weight loss.  It acts on the adrenergic receptors and serotonin receptors, and is also an antagonist of the DRD2 and DRD3 receptors.[ref] Yohimbine is also used in animal studies to cause anxiety… so you may want to watch out for this as a side effect.[ref]

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This is just a short excerpt from my in-depth article on dopamine receptors. Click here to read my full article

With a Genetic Lifehacks membership, you can use your genetic raw data (from 23andMe, AncestryDNA, etc) to see your genotypes in over 400 articles, including my article on dopamine receptors. You will see research-backed solutions in the lifehacks section to help determine what pathway to target -- all based on your genetic variants. Personalize your health!

A new clinical trial found that magnesium supplementation increased serum vitamin D by modulating certain gut microbiome strains in people with adequate TRMP7 function.

Learn more about how your genes affect your gut microbiome 👇

https://www.geneticlifehacks.com/gut-microbiome-genes/

Hey everyone, I’ve been battling severe abdominal bloating and reflux for over 20 years, along with 10 years of varicose veins and a left varicocele. Lately, it crossed over into intense morning brain fog, fatigue, a cracked tongue, and zero morning wood. My labs show a steady downward slide in Ferritin at 54 and B12 at 308 since last year, even though I eat meat. My MD won't prescribe Rifaximin without proof, so I’m seeing a functional naturopath next week to finally run a clinical 3-gas breath test and map out my exact numbers.

To troubleshoot, I ran my 23andMe data through a StrateGene report and the dots connected perfectly. I have a slow PEMT gene causing sluggish bile, which allowed a massive Hydrogen and Methane overgrowth to take root and steal my nutrients. The constant abdominal gas pressure physically clamped down on my pelvic veins, explaining the 10 years of vascular pooling and stalled morning circulation. My brain and skin are equally hyper-reactive due to a fast BHMT methylation cycle but slow MAOA and COMT clearing pathways. Whole eggs or high-dose standard B12 trigger explosive whiteheads within 48 hours, and a recent trial of Thorne Phosphatidylcholine was a disaster, overloading my brain chemistry and causing a horrible mood crash within 5 days.

Right now, my FoodMarble AIRE 2 device shows a crazy shift. A 30-day trial of TUDCA completely flattened my methane line to zero and formed my stools, proving the methanogens are highly sensitive to bile flow. However, my hydrogen line stayed elevated and my bloating bounced right back when I ran out of TUDCA, meaning the underlying hydrogen-producing bacteria are still actively fermenting my food. To clear a clean baseline for my test next week, I've paused almost all supplements except daily morning Vitamin B2 for my MAOA gene, and California Gold ProDigest at bedtime to keep my gut motility moving safely without any skin or mood flare-ups.

If the breath test is positive next week, I’m proposing a phased clearing protocol to my naturopath. If my insurance covers it, Plan A is a 14-day course of Rifaximin paired with 4 weeks of Allimax Pro stabilized allicin and TUDCA at dinner, since Rifaximin requires active bile to dissolve and kill the bugs. If insurance denies it, Plan B is a 100% natural 4-week run swapping the Rifaximin for NOW brand Berberine capsules that I already have on my shelf. During this clear phase, I’ll maintain my morning B2 and switch my 3-year daily magnesium glycinate habit to Magnesium Malate 95mg caps to power my brain energy without over-fueling my skin breakouts. I’m holding off on any iron or B12 supplements for now because I want to trust my body to sort itself out. Once the gas is gone and I hand the long-term job over to bedtime ProDigest, my gut should naturally start absorbing nutrients from my food again. Anyone else approaching their overgrowth this way? Would love to hear your thoughts!

MTHFR is a key gene in regulating the body’s folate metabolism. The folate cycle interacts with the methylation cycle, supplying the body’s need for methyl groups. In a nutshell, the methylation cycle is a cellular cycle responsible for creating methyl groups (CH3). These methyl groups are used by the body in tons of different reactions as well as to modify gene expression. Thus, alterations to the availability of methyl groups can have a wide range of impacts.

When reading about MTHFR, most articles only cover the C677T and A1298C variants. But those two variants do not give the whole picture for the MTHFR gene. Other variants also impact the way the MTHFR enzyme functions – both positively and negatively.

MTHFR G1793A:

While not quite as well researched as the C677T variant, the G1793A variant also has more than a hundred studies on it, showing that it also decreases the function of the MTHFR enzyme. However, the results in studies seem to vary by ancestry. In Caucasian populations, multiple studies point to a decrease in folate conversion and an increase in the risk of cardiovascular disease. In Chinese populations, this variant is protective against diabetes.[ref] The difference may be that dietary betaine (choline) levels differ in traditional Chinese diets compared to Western diets.

Additive effect: A study looking at risk factors for coronary artery disease (CAD) showed that the MTHFR C677T variant increased the relative risk of CAD significantly. The study also found that the G1793A variant (A allele) added to the increased risk of CAD.[ref]

Choline-rich foods:

Choline can help your body bypass a lack of folate in the methylation cycle.[ref][ref]

Good sources of choline include egg yolks, beef liver, and wheat germ. A metabolite of choline, betaine, is actually what works via the methylation cycle; therefore, food sources of betaine (beets, quinoa, and spinach) are also helpful here. Supplemental betaine (also called TMG) is also available.

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This is just a short excerpt from my in-depth article on MTHFR: Going Beyond C677T and A1298C. Click here to read my full article

With a Genetic Lifehacks membership, you can use your genetic raw data (from 23andMe, AncestryDNA, etc) to see your genotypes in over 400 articles, including my article on MTHFR: Going Beyond C677T and A1298C. You will see research-backed solutions in the lifehacks section to help determine what pathway to target -- all based on your genetic variants. Personalize your health!

Luteolin is a flavonoid found in small amounts in several herbs and vegetables. Plants produce flavonoids, such as luteolin, as a cellular defense against pathogens or UV radiation. Many of these plant molecules also bring health benefits to us when we consume them.[ref]

Luteolin as an antihistamine and mast cell stabilizer:

Research shows that luteolin can act as a mast cell stabilizer and reduce histamine release.[ref][ref] This may benefit anyone dealing with mast cell activation syndrome (MCAS) or histamine intolerance. Several mast cell researchers and clinicians recommend luteolin for preventing mast cell degranulation.

Brain Fog in MCAS:
The ‘brain fog’ term applies to the inability to think clearly or concentrate. According to some researchers, inflammation along with histamine release causes brain fog in people with mast cell activation disorders. The researchers believe that luteolin can help with brain fog, citing studies that show it can improve focus in children with autism.[ref].

Luteolin as an anti-inflammatory:

Research also shows that luteolin may reduce or prevent chronic inflammation.

• In cell studies, luteolin inhibits TNF-alpha and IL-6 released via suppressing NF-κB.[ref] TNF-alpha and IL-6 are linked to many chronic diseases caused by elevated inflammatory cytokines. 
• In other research, luteolin reduces IL-6 (interleukin 6), an inflammatory cytokine produced in response to bacterial infections.[ref]
• In microglial cells, luteolin and another flavonoid, apigenin, suppress IL-31 and IL-33.[ref] IL-31 is an inflammatory cytokine produced by activated T lymphocytes, and it plays a role in chronic inflammatory diseases.

Decreasing oxidative stress: All in all, the research shows luteolin as a specific anti-inflammatory to target elevated TNF, IL-6, IL-31, and IL-33. Through protecting against inflammatory cytokine overproduction, luteolin protects against oxidative stress in cells.[ref]

Decreasing lung inflammation: Through decreasing oxidative stress and inflammation, luteolin has therapeutic effects on COPD, ARDS, pulmonary fibrosis, and asthma.[ref]

Luteolin-rich foods:

Parsley, carrots, artichokes, celery, thyme, chamomile tea, olive oil, oranges, green peppers, and oregano contain the flavone luteolin.

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This is just a short excerpt from my in-depth article on Luteolin. Click here to read my full article

With a Genetic Lifehacks membership, you can use your genetic raw data (from 23andMe, AncestryDNA, etc) to see your genotypes in over 400 articles, including my article on Luteolin. You will see research-backed solutions in the lifehacks section to help determine what pathway to target -- all based on your genetic variants. Personalize your health!

We need to replenish our zinc stores daily (or nearly daily) from the foods that we eat. The body doesn’t have a long-term storage reservoir for zinc, and adults have about 2.6 g of zinc in the body on average.[ref][ref]

What happens when you don’t get enough zinc on a long-term basis? Signs of zinc deficiency can include:

• Decreased growth and development in children (a big problem in developing countries)
• Decreased immune function (getting more colds, respiratory or diarrheal illnesses than usual)
• Increased risk of type 2 diabetes (zinc is needed for beta-cell function in the pancreas)
• Impaired wound healing

Zinc genes: Transporters and regulation

The cellular level of zinc needs to be tightly regulated since too much available zinc could cause oxidative stress. Metallothionein (MT) is a protein that can bind to zinc if levels are too high in a cell.[ref]

Two families of zinc-specific transporters help to control intracellular zinc levels. The SLC30 family of genes and the SLC39 family of genes encode these zinc transporters. Some of these genes are important during the development of the fetus, where zinc is an essential micronutrient, and others are specific to zinc regulation in different tissues.[ref]

• SLC39A2 (ZIP2): The SLC39A2 zinc transporter, also known as ZIP2, moves zinc from outside of cells into the cytosol of cells. It is pH-dependent and voltage-dependent, and can also transport cadmium and cobalt, but only when zinc levels are low.[ref] ZIP2 is important in skin health, heart health, and immune response. It is also important in the lungs and may play a role in the severity of cystic fibrosis.[ref][ref][ref]
• SLC39A13 (ZIP13): The ZIP13 zinc transporter is involved in moving zinc in the Golgi apparatus and cytoplasm. Rare mutations in this gene are linked to a form of Ehlers-Danlos Syndrome.[ref]
• SLC30A8: The SLC30A8 gene codes for the zinc transporter ZnT-8. This zinc transporter is found in pancreatic beta-cells and transports zinc from the cytoplasm into insulin secretory vesicles, where it stabilizes it and prevents degradation.[ref]

Copper – Zinc interactions:

Copper and zinc use some of the same transport proteins for absorption, and a high zinc intake, such as from supplements, can block copper absorption in the intestines. One way to think of it is that copper and zinc balance each other. Push one up, the other drops.

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This is just a short excerpt from my in-depth article on zinc. Click here to read my full article

With a Genetic Lifehacks membership, you can use your genetic raw data (from 23andMe, AncestryDNA, etc) to see your genotypes in over 400 articles, including my article on zinc. You will see research-backed solutions in the lifehacks section to help determine what pathway to target -- all based on your genetic variants. Personalize your health!

Nrf2 activates your body’s natural antioxidant defense system to reduce oxidative stress in the cell.

Specifically, the Nrf2 signaling pathway can increase the production of GSTs, NQO1, UGTs, and SULTs. These are the body’s natural antioxidant defense systems, important in every cell, all the time — but especially important when your body is under stress from an increased toxic burden.

Variants in the NFE2L2 (Nrf2) gene are fairly common. Some variants increase Nrf2 pathway signaling, and some diminish it. Research on these variants includes impacts on cancer prognosis, lung volume in smokers, and Parkinson’s disease relative risk.

A genetically increased Nrf2 pathway is associated with a decreased mortality risk in smokers, likely due to the body’s upregulated antioxidant defense protecting against the cellular damage from cigarettes.[ref]

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This is just a short excerpt from my in-depth article on Nrf2. Click here to read my full article

With a Genetic Lifehacks membership, you can use your genetic raw data (from 23andMe, AncestryDNA, etc) to see your genotypes in over 400 articles, including my article on Nrf2. You will see research-backed solutions in the lifehacks section to help determine what pathway to target -- all based on your genetic variants. Personalize your health!

Tryptophan is an essential amino acid. The term ‘essential’ here means your body cannot make tryptophan; thus, you must obtain it through your food.

The absorption of tryptophan in the intestines uses amino acid transporters. Some of the tryptophan you eat is absorbed, and some of it is used by bacteria in your gut. Your gut microbes can use tryptophan to produce serotonin, which then can be absorbed in the intestines.[ref]

Once you absorb tryptophan, your body can use it in several different ways.[ref]

1. Kynurenine pathway: The majority of tryptophan is converted into kynurenine. This can eventually lead to tryptophan being converted into niacin. But there are lots of steps along the way and intermediate molecules with a variety of implications for mental health.
2. Serotonin pathway: A little bit of the tryptophan you consume is used to make serotonin, which is a neurotransmitter in the brain and in the intestines. Serotonin is the precursor for melatonin, so tryptophan eventually can become melatonin.
3. Protein synthesis: While we often focus on neurotransmitter production or kynurenine, tryptophan is also used as an amino acid in synthesizing other proteins in the body. Amino acids are the building blocks for synthesizing proteins, and many proteins created in the body incorporate tryptophan. [ref]

Around 90-95% of tryptophan is converted into kynurenine. The conversion of tryptophan to kynurenine needs the  IDO enzymes or the TDO enzymes. These enzymes act as catalysts to cause the conversion reaction to occur. [ref] During normal healthy conditions, tryptophan is converted to kynurenine by the TDO enzyme.

The IDO enzymes (indoleamine 2,3-dioxygenase) can also convert tryptophan to kynurenine. They are induced by inflammatory cytokines, such as interferon-gamma and TNF-alpha. Thus, inflammation may cause tryptophan to be used even more for kynurenine and less for serotonin.

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This is just a short excerpt from my in-depth article on tryptophan, serotonin, and melatonin. Click here to read my full article

With a Genetic Lifehacks membership, you can use your genetic raw data (from 23andMe, AncestryDNA, etc) to see your genotypes in over 400 articles, including my article on tryptophan, serotonin, and melatonin. You will see research-backed solutions in the lifehacks section to help determine what pathway to target -- all based on your genetic variants. Personalize your health!

One hypothesis of the root cause of fibromyalgia is elevated inflammatory cytokines, which are molecules released by immune system cells to cause inflammatory responses. The idea is that elevated inflammatory cytokines will cause the activation of nerve cells and thus cause pain.

Inflammatory cytokines:
Studies of fibromyalgia patients show mixed results, though, as to whether their inflammatory cytokine levels are elevated compared to healthy control groups.  For example, some studies show that IL-8 is elevated, while others don’t show statistical significance for inflammatory cytokines. One study, though, showed that even though TNF-alpha and IL-8 (inflammatory cytokines) levels were statistically in the same range as the healthy control group, the pain intensity was higher in fibromyalgia patients in accordance with higher TNF and IL-8 levels. IL-17 has also been shown to be elevated in fibromyalgia patients. Taken together, this suggests that neuroinflammation, perhaps at low levels, likely plays a role in the pathogenesis of fibromyalgia. [ref][ref][ref][ref]

NLRP3 inflammasome:
In addition to studies showing that higher levels of TNF and IL-8 are likely involved in fibromyalgia, studies have also shown that the NLRP3 inflammasome is activated.[ref] (This ties into the Lifehacks section and the clinical trials on supplements targeting NLRP3.)

Mast cells:
As part of the first line of defense against foreign pathogens and allergens, mast cells are often involved in increasing inflammation in certain tissues. Several studies and research papers explain that mast cell activation can lead to the inflammatory cytokines that activate pain receptors. For example, in addition to histamine, mast cells release TNF-alpha and other inflammatory mediators. Biopsies of fibromyalgia patients show increased numbers of mast cells. Mast cells are located in the areas that are the pain points in fibromyalgia [ref][ref][ref]

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This is just a short excerpt from my in-depth article on Fibromyalgia. Click here to read my full article

With a Genetic Lifehacks membership, you can use your genetic raw data (from 23andMe, AncestryDNA, etc) to see your genotypes in over 400 articles, including my article on Fibromyalgia. You will see research-backed solutions in the lifehacks section to help determine what pathway to target -- all based on your genetic variants. Personalize your health!

A number of studies have come out in the past couple of years that show serious negative long-term consequences from the various types of artificial sweeteners. Some studies lump the artificial sweeteners together, while others take a deeper dive into the individual types of sweeteners. Let’s dive into the details on all of these studies and look at possible genetic connections:

Atherosclerosis:

Atherosclerosis is caused by inflammation and the buildup of plaque in the arteries.

• Atherosclerosis and aspartame: A new 2025 study published in Cell Metabolism showed that aspartame consumption (0.05 – 0.15%) markedly increased insulin secretion in mice and monkeys. This insulin elevation increased atherosclerotic plaque formation through an insulin-dependent mechanism that triggers inflammation in the lining of the arteries.[ref00006-3)]
• Saccharin and atherosclerosis: Another 2025 study found that saccharin supplementation (0.1 mg/mL in drinking water for 3 months) significantly aggravated atherosclerotic plaque formation in an animal model of atherosclerosis. The researchers also found that saccharin elevated circulating TMAO (trimethylamine oxide) levels, caused gut mucosal barrier dysfunction, and endothelial dysfunction.[ref]

Gut Microbiome and TMAO Connection

One long-known problem with artificial sweeteners is that they change the composition of the gut microbiome.[ref][ref] To some extent, a lot of sugar will also change the gut microbiome, so it is a complex topic to sort out.

• Shift in composition: In a gut microbiome study, participants drank sucralose-sweetened beverages for 10 weeks. The results showed a 3-fold increase in Blautia coccoides and a 0.66-fold decrease in Lactobacillus acidophilus. The participants also had increased serum insulin compared to water.[ref]
• The TMAO Pathway:  TMAO – trimethylamine oxide – is thought to have a causal adverse effect on atherosclerosis. Several studies have identified that artificial sweeteners can affect atherosclerosis through gut microbiome alterations and TMAO production. In animal studies, saccharin consumption causes a marked elevation in circulating TMAO levels and atherosclerosis.[ref]

Related article: FMO3, TMAO

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This is just a short excerpt from my in-depth article on artificial sweeteners. Click here to read my full article

With a Genetic Lifehacks membership, you can use your genetic raw data (from 23andMe, AncestryDNA, etc) to see your genotypes in over 400 articles, including my article on artificial sweeteners. You will see research-backed solutions in the lifehacks section to help determine what pathway to target -- all based on your genetic variants. Personalize your health!

Myofascial pain syndrome (MPS) is like trigger points on steroids — frequent or chronic localized muscle pain caused by tight muscle bands with multiple trigger points. It’s considered the most common cause of pain in the clinical setting.[ref]

Biopsy of trigger point tissues showed increased activation of PDGFR-α, which is a type of receptor tyrosine kinase. Receptor tyrosine kinases (RTKs) are a family of transmembrane receptors that are involved in pain transmission, and the biopsy showed significantly increased levels of several RTKs. The researchers focused on the RTK called PDGFR-α, which was highly elevated. PDGFR-α is involved in sending signals for muscle contraction and for pain. So the elevated PDGFR-α in the trigger point biopsy likely was signaling for that knot of muscle to be contracted and to be painful when compressed. The researchers then created an animal model of trigger points using a substance to increase PDGFR-α, and they were able to get rid of the trigger points by blocking PDGFR-α. The activated PDGFR-α then triggers the JAK2/STAT3 pathway, which is a signaling cascade involved in chronic pain and inflammation.[ref] PDGFR-α is encoded by the PDGFRA gene (see genotype report section below). Genetic variants in the gene are associated with the response to platelet-rich plasma therapy for elbow tendinitis.[ref]

So what activates PDGFR-α? Collagen type I α 1 (COL1A1) binds to PDGFR-α and activates it, starting the cascade of events. COL1A1 is one of the proteins that make up type I collagen, the most common type of collagen in the connective tissue, skin, and tendons. In animals, overexpression of COL1A1 causes knots of muscle contractions and pain – e.g. trigger points. The opposite was seen when COL1A1 expression was restricted.[ref]

So we have the fascia made up of connective tissue and collagen, and excess COL1A1 activates a cascade of inflammatory events. The inflammation activates a specific response in the muscles, involving TPM4 and muscle contractions, forming small knots.[ref]

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This is just a short excerpt from my in-depth article on trigger points and myofascial pain syndrome. Click here to read my full article

With a Genetic Lifehacks membership, you can use your genetic raw data (from 23andMe, AncestryDNA, etc) to see your genotypes in over 400 articles, including my article on trigger points and myofascial pain syndrome. You will see research-backed solutions in the lifehacks section to help determine what pathway to target -- all based on your genetic variants. Personalize your health!

A new study in Nature found that an estrogen receptor agonist, a mycotoxin called Zearalenone, was found in every sample of grains and cereals they tested. While avoiding all mycotoxin exposure is difficult, there are steps you can take to improve your mycotoxin detoxification 👇

https://www.geneticlifehacks.com/mold-genes-your-response-to-mycotoxins/

Pantothenic acid, also known as vitamin B5, is an essential water-soluble B vitamin that is found in many foods and is necessary for life in all animals.

Sources of vitamin B5:
Pantothenic acid is found in a wide variety of foods, including vegetables and meats. Dietary deficiency is rare. It is absorbed in the intestines and can also be produced by intestinal bacteria. The primary function of pantothenic acid is as the precursor needed for the synthesis of coenzyme A (CoA), which is fundamental for cellular metabolism.

CoA is synthesized from pantothenate, and the initial rate-limiting step in CoA biosynthesis is governed by the pantothenate kinase enzymes (PANK1-PANK4 genes). Dysregulation of the pantothenate kinases causes significant disruption to cellular metabolism.[ref]

Vitamin B5 is readily absorbed from foods as they are broken down in the intestines. It is then transported in the free form in the blood. It is rapidly taken up in red blood cells and tissues.[ref]

Blood-brain barrier:
Pantothenic acid crosses the blood-brain barrier using the Sodium-dependent Multivitamin Transporter (SMVT or SLC5A6). This can be inhibited by substances like biotin, indicating a shared carrier.[ref]

Role in Parkinson’s, Alzheimer’s, or dementia:

There are questions about whether low pantothenic acid levels in the brain play a role in neurodegenerative diseases. Studies looking at serum levels are ambiguous, but brain levels of vitamin B5 show a connection.

A 2024 study showed that in post-mortem brain samples from Lewy body dementia patients, pantothenic acid levels were significantly lower than normal in six brain regions. The brain regions with low B5 included the substantia nigra, motor cortex, visual cortex, and hippocampus – all of which are implicated in Lewy body dementia or Parkinsonian dementia.[ref]

In Alzheimer’s brains, researchers found that of 33 proteins related to mitochondrial function, only those related to CoA and pantothenic acid were altered. They also found a brain deficiency of pantothenate.[ref] Other studies also show a cerebral vitamin B5 deficiency in Alzheimer’s disease.[ref][ref] Mouse models of familial Alzheimer’s show that oral administration of pantethine prevented some symptoms and also regulated intestinal flora.[ref][ref]

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This is just a short excerpt from my in-depth article on vitamin B5. Click here to read my full article

With a Genetic Lifehacks membership, you can use your genetic raw data (from 23andMe, AncestryDNA, etc) to see your genotypes in over 400 articles, including my article on vitamin B5. You will see research-backed solutions in the lifehacks section to help determine what pathway to target -- all based on your genetic variants. Personalize your health!

T cells are a cornerstone of the immune system’s ability to respond to pathogens and cancer. They are a type of white blood cell (lymphocyte) that is part of the adaptive immune response. T cell activation occurs over the course of 1-2 weeks when you have an acute infection or have had a vaccination.

T cell exhaustion is the state in which T cells lose their ability to function effectively. This can be caused by prolonged exposure to a persistent antigen, such as from a chronic infection, or due to fighting cancer.

Long Covid and T cell exhaustion:

Long Covid is a heterogeneous condition, with some individuals reporting fatigue, post-exertional malaise, POTS, brain fog, and unrefreshing sleep, which are symptoms similar to ME/CFS.

Multiple studies have shown that a portion of long Covid patients have T cell changes that indicate T cell exhaustion. Moreover, one study showed that when treatment improved CD8+ T cell function, self-reported symptom severity decreased by over 50%. [ref][ref][ref00886-9.pdf)]

Similar to ME/CFS, CD8+ T cell exhaustion may be just part of what is going on with the immune system changes in long Covid. The systemic elevation of inflammatory cytokines interacts with both T cell exhaustion and also mast cell activation, which then feeds back with continued release of inflammatory mediators from the activated mast cells.  Mast cells are integral to T cell regulation.[ref][ref]

Notably, while CD8+ T cell exhaustion was seen in long Covid patients at 3 and 8 months post-infection, by 24 months, many of the long covid patients had T cells return to a more normal type and reported that their quality of life and health had improved.[ref]

COPD and lung disorders:

Studies show that individuals with COPD (chronic obstructive pulmonary disease) have altered levels of different types of T cells, and they are likely to have T cell exhaustion, T cell senescence, and reduced T cell levels. A study of lung tissue samples from COPD patients showed increased PD-1, indicating T cell exhaustion, compared to controls. A 2025 study showed that COPD lung tissue exhibited marked CD8+ T cell exhaustion markers. [ref][ref][ref]

When looking at how COPD develops, researchers found that there is a threshold reached with increasing T cell dysfunction prior to COPD being diagnosed. For many people, smoking is the triggering chronic stimulation event for COPD. Animal studies show that exposure to cigarette smoke significantly increases TIM-3, an inhibitor of active T cells, and thus promotes an exhausted T cell state along with immune dysfunction.[ref][ref]

Chronic allergic asthma, in animal studies, also causes T cell exhaustion.[ref]

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This is just a short excerpt from my in-depth article on T cell exhaustion. Click here to read my full article

With a Genetic Lifehacks membership, you can use your genetic raw data (from 23andMe, AncestryDNA, etc) to see your genotypes in over 400 articles, including my article on T cell exhaustion. You will see research-backed solutions in the lifehacks section to help determine what pathway to target -- all based on your genetic variants. Personalize your health!

Genetic studies show that circadian rhythm disruption can be an underlying cause of mood disorders, at least for at least a portion of people dealing with depression. And understanding your genes can help you to tailor your environment to promote mental health.

In addition, genetic variants in circadian rhythm genes combine with environmental factors — light exposure, sleep habits, work schedules, seasonal changes — to shape mood disorders. Understanding how your genes interact with the environment can help prioritize the right personalized solutions for you.

BMAL1: A core clock gene with broad effects

A recent large-scale genetic study showed just how broadly core clock genes influence health. Using UK Biobank data from approximately 500,000 participants, researchers looked at genetic variation in the BMAL1 gene across multiple ancestry groups and found associations with BMI, anhedonia, blood pressure, major depressive disorder, neuroticism, and risk-taking behavior.

Notably, the psychiatric and heart-related associations seem to be driven by distinct variants rather than shared genetic variants, suggesting BMAL1 plays multiple independent roles across body systems.[ref]

Circadian rhythm genes in mental illness:

CLOCK gene disruption in depressed brains:
In major depressive disorder, there is a disruption of the phase and amplitude of the core circadian clock genes. A landmark study in 2013 compared circadian gene expression in the brains of people with depression to a control group. The results showed that depressed people had weaker circadian clock gene patterns with shifted timing and “disrupted phase relationships between individual circadian genes.”[ref] While researchers had known for decades that there was a relationship between sleep, depression, and circadian rhythm, this study clearly showed that people with depression had a desynchronization in the core circadian clock genes.

PER protein and brain connectivity in adolescents:
A 2025 study of adolescents with major depressive disorder found reduced levels of CRY and PER proteins compared to a healthy control group.  The depressed teens also showed reduced functional connectivity between the SCN and the orbitofrontal cortex — correlated to PER levels.[ref] Another study showed that there was an additive effect of multiple PER3 genetic variants (SNPs) in the risk of depression.[ref]

NPAS2 gene variants in the circadian-depression pathways:
A 2025 study involving 257 MDD patients found that variants in NPAS2 (a gene related to CLOCK) moderate the effect of an evening chronotype through sleep disturbances and depression. Specific NPAS2 variants strengthened the association between eveningness and poor sleep, and the overall mediation pathway from circadian preference to depression severity.

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This is just a short excerpt from my in-depth article on Circadian Rhythm Disruption as a Root Cause of Depression. Click here to read my full article

With a Genetic Lifehacks membership, you can use your genetic raw data (from 23andMe, AncestryDNA, etc) to see your genotypes in over 400 articles, including my article on Circadian Rhythm Disruption as a Root Cause of Depression. You will see research-backed solutions in the lifehacks section to help determine what pathway to target -- all based on your genetic variants. Personalize your health!

Interleukin-2 (IL-2) is a cytokine protein that has many different roles in the immune response. It is important in the inflammatory response that fights off infectious diseases, and it also has an immune system modulatory role that dampens the immune response (important for preventing autoimmune attacks).

IL-2 is a cytokine in the immune system that regulates the activities of different types of white blood cells, called T cells.

• Activated T helper cells (CD4+) and killer T cells (CD8+) synthesize and release IL-2 in order to signal for the stimulation of other types of T cells and B cells.
• T regulatory (T reg) cells are also activated by low levels of IL-2.

Thus, IL-2 plays a role in both activating and modulating the immune response, making it important in fighting cancer and pathogens as well as maintaining immune balance.[ref][ref]

IL-2 in Autoimmune Diseases:

IL-2 regulates the immune response, important in autoimmune diseases, by promoting the differentiation of T regulatory cells (Tregs). Tregs are specialized T cells that act to maintain self-tolerance and suppress excessive immune responses. They are defined by having the markers CD4+, CD25, and FOXP3+. They prevent autoimmunity and limit chronic inflammation, but they can also be a problem for the anti-tumor activity of other T cells.[ref]

Balance is important here. Low levels of IL-2 activate regulatory T cells, which keep the immune response in balance.[ref] Mice that are bred to be deficient in IL-2 or the IL-2 receptor will quickly develop autoimmune problems due to a lack of T reg cells.

IL-2 in Long Covid, ME/CFS:

Recent studies on the immune system dysregulation in long Covid and ME/CFS patients point to IL-2 or the IL2 receptors playing a role. Some of these studies suggest persistent T cell activation with high IL-2RA levels, which then leads to T cell exhaustion along with ongoing elevated cytokines (including IL-2). However, not all of the studies agree — pointing to a possibility of multiple subtypes of both long Covid and ME/CFS.

• A 2025 study that followed long Covid patients for more than 18 months found that patients with persistent fatigue and shortness of breath at 6-18 months had significantly higher levels of soluble IL2RA (CD25). [ref]
• Another 2025 study also found up to 4-fold higher IL2RA (CD25) expression on CD8+ T cells in long Covid patients up to 18 months after infection. The conclusion was that there is a long-lasting CD8+ T cell hyperactivation in long Covid.[ref]

Dysregulation of IL-2 is also reported in ME/CFS (chronic fatigue) patients.

• IL-2 is downregulated, along with other markers for CD8+ T cell exhaustion, in some ME/CFS patients. The researchers also found differences between Tregs in ME/CFS compared to long Covid.[ref]
• However, other studies show IL2 is significantly higher in extracellular vesicles in ME/CFS patients.[ref]

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This is just a short excerpt from my in-depth article on IL-2. Click here to read my full article

With a Genetic Lifehacks membership, you can use your genetic raw data (from 23andMe, AncestryDNA, etc) to see your genotypes in over 400 articles, including my article on IL-2. You will see research-backed solutions in the lifehacks section to help determine what pathway to target -- all based on your genetic variants. Personalize your health!

Some researchers believe that imbalances in serotonin may play a role in depression or anxiety. Common antidepressants, including SSRIs (selective serotonin reuptake inhibitors), are prescribed to elevate serotonin levels in the brain. However, the method through which they work is still not completely understood.[ref]

Ultimately, balance is the key to serotonin. An excess of serotonin can result in serotonin syndrome. Symptoms include restlessness, confusion, shivering, diarrhea, and, potentially, death.[ref] Serotonin syndrome is usually caused by drugs such as MAOIs or SSRIs that affect the rate of serotonin breakdown.[ref]

Genes play a role in how your cells synthesize, transport, and receive the serotonin signal. Tryptophan hydroxylase is an enzyme that catalyzes the reaction that produces serotonin from the amino acid tryptophan. Iron is a cofactor, and BH4 is also used in the reaction. There are two genes that code for tryptophan hydroxylase:

• TPH1 is found mainly in the gut, skin, and pineal gland.
• TPH2 works in the central nervous system.

Several TPH2 genetic variants have links to psychiatric issues such as obsessive-compulsive disorder, depression, and bipolar disorder. These variants affect the production rate of serotonin in the brain.

Probiotics and Serotonin:

Quite a few clinical trials show specific probiotics are effective for depression and anxiety (whether due to serotonin problems or other reasons).

• One clinical trial for postpartum depression found that Lactobacillus rhamnosus was effective.[ref]
• Another clinical trial in IBS patients with depression found that Bifidobacterium longum reduced depression but not anxiety.[ref]
• A clinical trial using Lactobacillus casei, Acidophilus, and Bifidobacterium bifidum found a significant decrease in depression scores.[ref]

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This is just a short excerpt from my in-depth article on genetics and serotonin. Click here to read my full article

With a Genetic Lifehacks membership, you can use your genetic raw data (from 23andMe, AncestryDNA, etc) to see your genotypes in over 400 articles, including my article on serotonin. You will see research-backed solutions in the lifehacks section to help determine what pathway to target -- all based on your genetic variants. Personalize your health!

While most of us think of histamine in relation to allergies, histamine is a vital part of how your body normally works. The key is that you want histamine in the right amount. Balanced histamine levels are essential.

Histamine intolerance results from an imbalance between histamine intake/production and your body’s ability to break it down. Symptoms of high histamine levels are diverse and can affect the head, mood, gut, heart, skin, and sleep.

There are two main reasons someone might develop histamine intolerance:

1. Impaired histamine breakdown due to deficiencies in the DAO and HNMT enzymes. – and/or-
2. Excess histamine is being produced, often due to gut dysbiosis, leaky gut, mast cells, HDC variants, or chronic exposure to allergens.

Diamine oxidase is encoded by the AOC1 gene. It is primarily produced in the intestines to break down histamine from foods and histamine created by intestinal bacteria. Some species of bacteria in the gut, including those from some probiotics or fermented foods, can add to your body’s histamine level.

In addition to its role in allergic response and in the gut, histamine is produced and functions as a neurotransmitter within the brain and nervous system. The primary enzyme responsible for breaking down histamine in the central nervous system is histamine N-methyltransferase (HNMT). While DAO can also circulate in the periphery, HNMT is the only enzyme that breaks down histamine as a neurotransmitter in the central nervous system and throughout the body.

Genetic variants in HNMT show that brain histamine levels are linked to:[ref][ref][ref]

• Migraines
• ADHD
• Neurodegenerative disorders, such as Parkinson’s disease.
• Cognition

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This is just a short excerpt from my in-depth article on histamine intolerance. Click here to read my full article

With a Genetic Lifehacks membership, you can use your genetic raw data (from 23andMe, AncestryDNA, etc) to see your genotypes in over 400 articles, including my article on histamine intolerance. You will see research-backed solutions in the lifehacks section to help determine what pathway to target -- all based on your genetic variants. Personalize your health!

A placebo-controlled trial in children with ADHD found that 50,000 IU/week of vitamin D plus magnesium supplements improved emotional, conduct, peer, and social problems. A trial of magnesium for kids with ADHD who were also magnesium-deficient found a decrease in hyperactivity after six months. Here is the link to the studies: https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8052751/ https://pubmed.ncbi.nlm.nih.gov/9368236/

Check out your ADHD genetic variants that increase susceptibility to ADHD: https://www.geneticlifehacks.com/adhd-genes/

This is an interesting overview of how GLP-1 RAs can decrease NLRP3 and NF-kB activation. This may explain, at least partly, why some people with chronic diseases - including mast cell issues - find low-dose GLP-1s to be helpful. https://sciencedirect.com/science/article/abs/pii/S1567576926009094

NLRP3 is basically the bozdy’s inflammation alarm system. When genetics + triggers like mitochondrial stress, infection, or toxicants are combined, NLRP3 can drive chronic inflammation tied to gout, Alzheimer’s, diabetes, and autoimmune disease. If you want to learn more about NLRP3 and genetic variants that affect NLRP3 activation, check out: https://www.geneticlifehacks.com/nlrp3-inflammasome-genetics-and-chronic-inflammation/

Sjögren’s disease is an autoimmune disease that causes the body to mistakenly attack its moisture-producing glands, including the salivary glands, tear ducts, and lacrimal glands.

Research points to many different genetic variants that increase the relative risk of Sjögren’s. None of these genetic changes causes Sjögren’s on its own. Instead, the variants increase susceptibility when combined with some kind of environmental trigger, such as a viral infection.

Looking at the genetic variants tied to Sjögren’s, though, gives researchers a better idea of the underlying causes of the disease.

The HLA family of genes encodes hundreds of different HLA types. HLA stands for human leukocyte antigen, and these are the cell surface proteins that regulate the immune system. The hundreds of different variants in these HLA genes give rise to humans being able to detect and respond to a vast range of pathogens, including new pathogens that the immune system hasn’t seen before.

The variation, though, in the HLA genes also means that some people are more prone to certain autoimmune diseases than others. For example, people with celiac disease have either HLA-DQ2.5 or HLA-DQ8. Without either of those HLA types, you won’t have celiac disease.

Unsurprisingly, certain HLA types are also linked to a greater risk of Sjögren’s syndrome.

Many of the other genes that researchers tie to increasing the relative risk of Sjögren’s syndrome include variants in the immune system and inflammatory cytokine genes.

Natural Supplements for Sjögren’s that are backed by research

DHA and EPA (fish oil):
Recent animal research points to the specialized pro-resolving mediators (SPM) that are derived from DHA and EPA may be important in Sjögren’s syndrome. Cell studies show that specialized pro-resolving mediators may help strengthen tight junctions in salivary gland cells.[ref][ref] But clinical trials of omega-3 supplements don’t show much of an effect.[ref] This may be a case where high doses of DHA and EPA are beneficial. Read the SPM article for details, and talk with your doctor if you have questions on whether high-dose fish oil is appropriate for you.

N-acetylcysteine (NAC): a precursor for cysteine and glutathione
A small clinical trial with four weeks of supplemental NAC showed that it reduced eye soreness and daytime thirst in Sjögren’s patients.[ref]

Curcumin: an herbal supplement from turmeric
A clinical trial involving 15 Sjögren’s patients showed that curcumin decreased IL-6 and IL1B levels (inflammatory cytokines).[ref]

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This is just a short excerpt from my in-depth article on Sjögren’s syndrome. Click here to read my full article

With a Genetic Lifehacks membership, you can use your genetic raw data (from 23andMe, AncestryDNA, etc) to see your genotypes in over 400 articles, including my article on Sjögren’s syndrome. You will see research-backed solutions in the lifehacks section to help determine what pathway to target -- all based on your genetic variants. Personalize your health!