true, many persons fast regularly, some of those i know do this because they feel better, i have a friend (~60 years old) fast 1 day per week, he have some problems with hypertension, salt... and says that this help him (maybe there is religious background too)

To give the stomach a rest, to cleanse the body inside and flush out the toxins and waste the next day.

some ppl fast to test their will power..dat de can stay alive widout food one day.. its also a way of sacrifice..with a religious aspect to it.. ppl wish to tax themselves in order to repent for their sins.

in some religion it is a part of re legion, in Islam you have to fast one whole month in the year, and in Hinduism wives also fast for there husband. and in Christianity there is also fastening in which they only eat food not cooked on fire.