Eli5: if on a diet why cant someone live off the calories they have stored up as fat before introducing new calories while losing fat? Ie why cant we slim down with exercise before eating more food?

Question

Eli5: if on a diet why cant someone live off the calories they have stored up as fat before introducing new calories while losing fat? Ie why cant we slim down with exercise before eating more food?

In: 20

Answer 1

It IS possible if you get the necessary vitamins and essential stuff (because you need more than just energy form food, you need the building blocks of stuff your body needs).

Anyway, with the supervision of doctors and daily vitamin pills, electrolytes, and amino acid supplements, Angus Barbieri didn’t eat for 382 days. He dropped from 486 to 180 lbs.

[https://en.wikipedia.org/wiki/Angus_Barbieri%27s_fast](https://en.wikipedia.org/wiki/Angus_Barbieri%27s_fast)