If you completely stop eating your body will initially lose weight. Unfortunately after you start eating again your body will go into what is known as a starvation reaction and begin to store everything it can. This means you will gain the weight right back and probably more than you lost. It is your body’s reaction to being starved. It thinks that it needs to hoard calories because it might not get what it needs later on. It is not good for you to starve yourself to lose weight. It can cause more health problems then being overweight and can even shut down your kidneys, liver, and digestive system. The best way to lose weight is diet and exercise. If you are grossly overweight always consult your doctor before starting a weight loss program.