Yes, the non-receiving of food may help in the Faith and not only, but usually for a short time, at least because later again may be necessary the receiving of food, while namely/only the Keeping of the Commandments is Lasting and True(-ly) spiritual(-ly). Otherwise, however much to starve, if the Commandments again are not Kept, then there will not be Achieved the Required effect.
1 Timothy 4:8 "For bodily exercise profiteth little: but godliness is profitable unto all things, having promise of the life that now is, and of that which is to come."
qtld and to all participants on this Thread, yes quite clearly Paul is emphasizing the "unseen" rather than the "seen" as he also points it out in the following:
* 2 Corinthians 4:18 While we look not at the things which are seen, but at the things which are not seen: for the things which are seen are temporal; but the things which are not seen are eternal.
Thus, what is the real message of FASTING by "divine revelation?"