How long does a body go with out food before it starts burning BODY fat?

If you stop eating food for a while, eventually, your body begins to burn at the fat stored up in the body. How long would someone have to go with out food before that happens? A day?
I was asking because one time I went 2 days with no food and I was wondering what it might have done to my body. Not because I want to starve myself skinny guys ;P

Your body will run normally for 72hrs without food before going into starvation mode. At that point, your body will assume there is no food coming,and it will lower your metabolism so that you burn less calories throiugh out the day, Then it will start burning lean muscle mass for energy. This will leave you with a flabby appearance, even though you are losing weight and getting smaller. That is why you have to weight train when you diet, so you don’t lose muscle. That is also why people who diet, then regain weight, end up looking wors in the end. Because they lost muscle and gained fat. One pound of fat takes up more space than on pound of muscle. So if some one lost 15lbs of muscle and then gained 10lbs back of fat, they may end up wearing a bigger pants size, even though technically, they lost 5 lbs.

In a nut shell – - Always weight train!!

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