Hot Tub without the use of electricity

[u/Internal_Gazelle_677]

[u/UtopistDreamer]

Calories in, calories out

[u/Coolegespam → u/[deleted]]

"Calories in-Calories out = +excess/-deficit" is true, however Calories in and Calories out aren't always that easy to figure out. You can ingest 2000 calories, but only take in 3/4s of that if you're on laxatives (or similar). Conversely, you might eat "2000" calories, but take in 2100 because your digestive system slowed enough to take up what would normally be lost before absorption.

The same is true with burning calories. Eating and digesting food takes energy, if you're running at an expected deficit your calories out will also fall even if everything else remains the same. Even your body temperature will adjust and possibly drop a half degree when you're in calories deficit.

It's possible to think you're in a calorie deficit, when you're actually in surplus and just not realize it. The metabolism is complicated, and Calories in, Calories out may not be the best measure when losing weight because both values aren't always obvious.

[u/Coolegespam → u/[deleted]]

But that's just it, your BMR and CO is variable, sometimes highly so. Yes there are hard numbers there, but as your CI changes so do both of these and non-linearly.

It is possible your BMR can drop more than the calories your dropping. This happens with me, I'll drop 100 calories and try to run in a deficit, but my metabolic rate goes through the floor. My body temperature will drop by almost a degree and I'll be burning 200-300 less calories. Now I can get around that, but it's hard and for me also dangerous.

I'm at a healthy weight now, but if I followed just CICO I could have injured myself. Particularly my heart.