Calories is an energy measurement of the amount of energy obtained from food that is available through cellular respiration.

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At what point do I start to burn muscle on a calorie deficit diet?

If I'm on a calorie deficit and trying to burn fat, at what point do I start burning muscle instead of fat? How can I be sure that I'm eating enough to minimize muscle loss, but remain on a calorie ...
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How can I calculate calories burned during an activity?

I've found various online "calculators" for looking up how many calories are burned when doing an exercise like using an Elliptical machine. Is there a way to calculate how many calories I burned ...