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by hgomersall
1214 days ago
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The problem, which I can't work out if you know about but ignoring or are ignorant of, is that humans have inordinately strong control systems to maintain some state, as well as hugely influential effects from e.g. a gut biome. To say "it's just thermodynamics" might be right as far as the physics goes, but it doesn't recognise that biological drives overwhelm everything. It's hugely complicated how energy expenditure and steady state energy consumption interacts with weight gain, not least because the body will invariably work to make your actions as efficient as possible to maintain weight. For example, observational studies of hunter societies that might travel large distances daily, energy requirements bear little relation to daily activity after any transition time has elapsed when compared to relatively inactive Western counterparts. These people can't just will their activities to be less efficient if they hypothetically wanted to consume more energy. Ultimately, the biology will decide what the effect of any intervention is, regardless of how motivated or not you are. Any advice that doesn't explicitly factor that in is just hot air. |
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If energy intake matches energy needs then body fat percentage stays the same.
If energy intake exceeds energy needs then body fat percentage increases as the body stored the excess as fat.
If energy needs exceed energy intake then body fat percentage decreases as fat is used as fuel.
https://en.wikipedia.org/wiki/Basal_metabolic_rate