>how many kcal does one have to eat in a day to maintain being 600lbs
Given a 30 year old male, 5’9, sedentary job, roughly 4,406 kcal.
Female, same weight, 5’4′, roughly 4,112 kcal.
>and how is it that your body doesn’t just burn it off as your metabolism speeds up
Your metabolic rate is divided into two categories. What your rate of metabolized energy is for existing without movements(maintaining basic homoeostasis) and then adding in movement. The base cost increases the more cells you have, including fat cells. The active cost differs between sleeping and running up stairs.
So the people that claim they’re skinny because they have a fast metabolism are misunderstanding that part. The more fat cells, the higher your metabolic demands of energy. Its not a genetic lottery system.
Conversely; the people claiming weight loss efforts are somehow futile because your metabolic rate decreases as you lose fat cells aren’t regonizing what the ‘rate of metabolized energy’ means.
But even as it increases, the input energy can match the output and no weight loss or gain occurs. If you’re asking why doesn’t the body just increase output infinitely, its because there was no demand for it to do so.
And active efforts to lose weight(increasing output) meets [incredible resistance](https://www.youtube.com/watch?v=eXTiiz99p9o) vs reducing inputs.
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