My two cents worth... I exercise (cardio and lift) about an hour and a half after eating a small meal. I can't exercise on a full stomach, nor on a completely empty one without feeling ill. In cardio, after 10 minutes, the body reaches a 'steady state' and uses both glucose and fatty acids in the bloodstream for energy. It doesn't burn more fat than glucose or vice versa than you are programmed for. The number of calories you burn is determined by the length of time you do the cardio. Weight lifting itself doesn't burn a huge number of calories. The benefits of lifting are different than cardio. However, in both kinds of exercise, your metabolism is increased and you continue to burn calories at an accelerated rate for a while longer (some sources say 8 hours and others say 24 hours).
The absolute best time to workout is when you can.
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