I learned about the high histamine foods here on the forum. Laughingdogs often mentioned this and finally one day I decided to do a little research. The only 3 high histamine foods that I was eating were the cheese, kefir and raw egg whites every day in my breakfast smoothie. Once these were eliminated I noticed a dramatic improvement.
When I eat purely primal I feel amazing. Just meats, fats, veggies, eggs and nothing else.