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Re:1min high-intensity exercise 3x a week improves fitness a... by kasey_junk on Wednesday January 25, 2023 @11:53AM (#34520697)
Both your calories in numbers and calories out are subject to extreme estimation error.

Also body composition changes can make “weight loss” difficult as you replace fat with muscle. You can also get a gross estimate of muscle/water/fat mass to see those changes (or go get a very accurate measurement a few times in a facility equipped for such things).

Re:1min high-intensity exercise 3x a week improves fitness a... by caeril on Wednesday January 25, 2023 @02:07PM (#34522736)
This is generally the correct answer.

Online TDEE calculators almost always overestimate expenditure, as do smartwatches. On the intake side, people lie to themselves constantly. First, they generally don't actually weigh their portions. In the rare event they really are weighing their food, they'll "accidentally" load up 4.3oz of something, then input it into their tracker as 4oz. Then they'll neglect to log their sauces and condiments, because it's "only" 20kcal for a tablespoon. These discrepancies add up.

Invariably, these ridiculous claims come down to people being liars, not just to others, but to themselves.