Eggplant is one of the vegetables in the nightshade (Solanaceae) family, which includes bell pepper, tomatoes, and potatoes. Anecdotal case histories link improvement in arthritic symptoms with removal of these foods. Although no case-controlled scientific studies confirm these observations, some individuals consuming nightshade-family vegetables experience an aggravation of arthritic symptoms and may benefit from limiting or avoiding these foods. Eggplant contains significant amounts of oxalate. Individuals with a history of oxalate-containing kidney stones should avoid overconsuming them.