"Don't Eat Fruit - especially Watermelon!"

I have an intolerance for absolutists. Words and phrases -"never", "always", "do it this way" or "don't do it this way" - are a big part of their vocabulary. I especially get rattled when these sort of blanket comments are coming from an expert. Recently, a friend came to me and asked why her Doctor would tell her, when discussing her nutritional approach to solving her current health crisis,