Verified answer

The energy you use for walking, you get from your food. Your body uses up sugar first, then carbs, then fats, then protein, then uses body fat and protein stores if nothing else is available. People who are overweight find themselves hungry all the time because they need extra energy (food) to carry all that weight around. This makes it so hard to diet. If you did not eat anything for several days, your body would start burning fat reserves and you would lose weight, but this is not your body's preferred energy source. You feel tired and hungry and are unable to concentrate.

So you don't normally use body fat as an energy source.

No, because the rate of fat burning is improportianate to the weight of the person walking

cuz thats what the chicken said