you're supposed to 'believe' to benefit from the best case scenario dude :) just rationalizing about it is not supposed to be enough...
and additionally, fasting was around before it was introduced in islam; check it's versions in judaism, christianity... actually, it was also around before that. people used to fast during equinoxes for a very long time for all sorts of different ceremonies...
and additionally, fasting was around before it was introduced in islam; check it's versions in judaism, christianity... actually, it was also around before that. people used to fast during equinoxes for a very long time for all sorts of different ceremonies...