This site does an excellent job of summarizing the research and clinical data available.
Essentially, the following food groups could be harming your body:
- grains, especially wheat and wheat germ but also quinoa, rice, buckwheat, oats, rye, barley, millet and corn.
- legumes (all dried beans, including soy and peanuts),
- dairy (perhaps more so when cows are feed grains instead of grass, a speculation based on research showing transference of lectins into breast milk and dairy.
- nightshade (includes potato, tomato, eggplant and pepper).
Experiment with removing the food groups above for 7-10 and see how you feel. Listen to your body, it will guide you.