Fasting cleanses the body and a starved body will turn to its own body fat for energy causing a rapid fat loss and give a toned, trim look. Too much fasting though causes the body to eat away at the muscle. A better way of doing this though I would have thought would be to cut out the carbohydrates and feed a high protein diet causing them to go into keytosis[where the body burns its own body fat for energy], this is assuming the body of a pigeon works similar to a human body when it comes to fats, carbohydrates and proteins, lol.