Foods such as eggplant, tomatoes, potatoes, goji berries, tomatillos, gooseberries, pepino melons, paprika, okra, and both spicy and sweet peppers have a hidden dark side. These foods belong to the nightshade, or Solanaceae, family. While nightshades sound scary, most people are relatively unaffected by these foods. For people with autoimmune disease or sensitive digestive systems …