I was told that you break down muscle fibers with resistance training and build the muscles back when you sleep (provided you have enough protein). What about fat burning? Do you burn fat while you work out? Sleep? I understand you lose weight when there is a calorie deficit but when does it actually happen?
In: Biology
None of that is true except for the fact that you lose weight when in a calorie deficit.
Your body processes are functioning all the time. There’s no magic time when your body decides to burn fat. If your body runs out of stored glucose it will convert some fat to glucose and use that. You could be sitting on the couch when it happens.
The same thing with muscle tissue. It may be more likely to happen after a meal when the levels of amino acids and insulin in the body are high, but again, it could also happen while you’re sitting on the couch.
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