Why can't you lose weight by not eating if weight loss is caused by expending more calories than are consumed?

Answer 1

If you don't eat ANYTHING, you end up destroying your muscle mass and muscles keep you healthy and burning calories. If you starve yourself, the muscle mass is diminished then you gain back more fat next time you start eating, and you can eat a lot less and gain weight. Eventually you destroy your health. Don't start that program, it's hazardous to your health also, your body will go on calorie saving mode since your not eating it will save a lot of fat.

weight lossif you stop eating your body believs it is starving and so slows down your metabolism so you burn less calries than you would if you had eaten. also for the same reason your body stops burning body fat and breaks down muscle mass instead. so as you may well lose weight you will lose very little fat.

BMR

Living bodies' requires calories to perform involuntarily functions such as heart beats, digestion e.t.c. which is known as BMR (basal metabolic rate).BMR is the minimum no. of calories required by a body to sustain life. Each individual has its own BMR according to his activities and life styles. For people who have sedentary life styles their bodies adjust to consume fewer calories to perform involuntarily functions because there is no additional calories requirement by the body to do additional activities. Therefore if a person start eating less the body will automatically adjusted its BMR to the amount of calories ingested. Therefore it's mandatory to have a balance in calories consumption and physical activity.Also with exercise you are not just attaining a goal to get slimmer but you are increasing your bone density, muscle mass, flexibility and cardio conditioning as well.