Allergic to bananas and blueberries. Most of the others are migraine triggers due to the high vitamin C, which will take me out of commission for anywhere from hours to days.  Avocados are very tasty though.  For the most part, I plan to stick with eating steak and lamb.  Very easy and fast to prepare, keeps me full for a long time.  Plus the large iron load allows me to donate blood on a regular basis.