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Yogurt

Best

Some types of yogurt contain probiotics—or beneficial microorganisms—and some researchers now believe there may be a connection between rheumatoid arthritis and the gut.

If that's the case, the more good bugs the better. "There's a theory that a healthy gut may control some of the inflammation . . . if you have good bacteria fighting for you," says Sandon.

Like other dairy products, yogurt may be fortified with beneficial vitamin D (check the label), but best to avoid it if you have an allergy.