I remember that too.I'm late to the game with this thread, but, I remember listening to Ray talk about fruits and one of the issues he mentioned was the type of fiber in the fruit that could be problematic in the gut; such as mangos and pineapples. In an interview he mentioned being in a country where mangos were plenty. The natives to that country told him about mango sickness. I don't remember all the details. He also mentioned pineapples are high in tryptophan.