When an Avatar has to manifest, for some period before His manifestation He either fasts, keeps silent, or adopts some inner discipline for the benefit of the world. He does not do this for His own sake because, having attained to the Highest, nothing is left for Him to do for His own self. But before manifestation, whatsoever He does, His mind is universal.
Buddha never ate food cooked by others.
Jesus fasted forty days.
I keep silent.
-Treasures from the Meher Baba Journals, p212