User Avatar KopaJun 01, 2021

What’s the Deal with Nightshades and Psoriasis?

Medically reviewed by Allison Truong, M.D.

When we think of vegetables or fruits, we rarely think of them as something that might do harm to our bodies. In general, they’re a delicious nutrient-delivery service sprung from the ground. But in the case of those that fall into the nightshade category, the conversation takes a turn. There’s concern among some people with psoriasis that these vegetables—which contain a chemical called solanine—could cause symptoms to flare. Here, Elizabeth DeRobertis, a New-York based registered dietitian, answers our most pressing nightshade-related questions.

What exactly is a nightshade?

Nightshades are part of the plant family Solanaceae. This family of vegetables and fruits contains a chemical called solanine. Some people think that solanine may increase inflammation; it’s toxic in very high concentrations. Some of the most common nightshade vegetables people eat are white potatoes, tomatoes, eggplants, bell peppers, cayenne peppers, and paprika.

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