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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Super simple version:
In order to condense the sugars in our body for storage, water is removed from them. So, water is needed to release them as well. Some of that comes from dehydration. This is how most of the glucose is stored as glycogen in our liver, and sustains us between meals and at night.
When glycogen isn’t able to be used, for whatever reason, fat is used. Due to the way that fat molecules are arranged and processed, they leave behind something called a Ketone when used for energy. These ketones are acidic and will make people sick if too many build up.
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