Your comment on garbage info on on garbage blogs that seems to dominate google search results is on point. But there is plenty of good data and studies from legit sources if you sort through it. Here is one of the key papers that drove interesting in fasting and immune system repair:

http://www.cell.com/cell-stem-cell/fulltext/S1934-5909(14)00...

BTW, if you only talked to a few doctors, and one of them supports it, that's actually a fairly high percentage: 20-33%.