Most people, when they go back to eating, usually compensate by upping their consumption of calories. There are benefits to fasting for purposes other than weight loss. I have experimented with fasting one day a week, consuming nothing but water or herb tea. This can be a useful physical and psychological discipline.
Many people experience a clearer mental state and increased energy after a short-term fast.
Short-term fasting for up to three days is a good home remedy for illnesses like colds, flus, and toxic conditions generally. Combine it with rest and a good mental state. Drink plenty of water to help remove toxic products from your system. Also remember to conserve energy, stay warm, and break your fast with light, plain foods. It is a drastic technique.