When we need energy, can’t the body just burn the stored fat? Isn’t that the whole point of stored fat? Why will we feel hungry, weak, lightheaded, etc. at all? I understand if the body doesn’t have enough fat (if you’re super skinny), it would make sense to feel hungry, but I don’t understand why would that be the case if there’s enough fat to go around.
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First the body goes to find energy in the food you have eaten, when that is empty, it takes a little while before the body goes into ketosis, which basically means you are now burning fat. To keep your body in ketosis, you need to keep you carb intake close to zero. It takes at least a day or two before your body enters this emergency fat burning mode.
There is a lot of energy in that fat, so you can live surprisingly long on 20kg extra fat, but its a slow process that itself takes energy. So you wont have ANY energy to spare. Imagine being on a life raft for 3 months, thats about the level of energy you are able to exert.
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