1 gram fat produce 9 calories i.e. 37.7 kJ
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fat = 9 cal/gram; carbs and protein = 4 cal/gram; alcohol = 7 cal/gram therefor 4 grams of carbs has 4x4 calories = 16 calories
fat
it is not bad to burn calories because if you do it is good but if you don't burn any than the leftover calories will turn into fat
If one burns off roughly one calorie per 20 steps, then it should take about 70,000 steps to burn off 3500 calories or 1 pound of body fat.
It depends on what your lean body mass is (i.e. how much muscle you have -- this is what 'burns' the fat) and what your pace is (how hard your heart was working).