Let’s say you have the flu and you lose 10 lbs over a week or so due to not being able to eat much. Why do you regain it, especially if you’re eating under maintenance/in a deficit normally?
It can’t all be water if you don’t eat for a week right? That’s a huge deficit.
In: Biology
Assuming a usage of 1500 calories per day (when sick you will probably be laying in bett and doing nothing so it will be lower than your usuall) and 7 days strictly no eating that would be 3 pounds of fat lost though you will also lose muscle. So if you lost 10 pounds 7 pounds is just water. Also you might have been in a deficit with 10 pounds more you might not be with 10 less so you start gaining again depending how big your deficit was.
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