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:
Not only is it wrong, it's also incorrect. I used to work in healthcare IT so a "few doctors" to me is different than other people. But I got his point, I didn't see the need to get too technical.
A few generally is 2 or 3. If you are talking to scores of doctors, and calling it a few because you work at a hospital, then it is the usage of the word that is incorrect.
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%.