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Eggplant

Best and worst

Eggplant is a "nightshade vegetable," in the same category as tomatoes and potatoes. Evidence is mixed on the benefit—or harm—of these items.

"There are people who claim nightshades are helpful and others who claim they're aggravating or not helpful," says Dr. Matteson. There's no evidence that support claims one way or the other. And cutting out nighshades may cut you off from other helpful compounds, such as capsaicin in red peppers, which can dampen inflammation.

Next: Gluten