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All fish is low in saturated fat, and many varieties of fish contain a good type of fat called omega-3. Omega-3, found in fish oil, appears to benefit us in several ways. As well as helping prevent heart attacks and strokes, there is evidence that fish oil helps prevent or treat depression, arthritis, colitis, asthma, and dry skin. It may also help us lose weight.

Shellfish, such as shrimp, were once labeled high in cholesterol, and avoided by people with concerns about their diets. But this has been proven wrong. Feel free to enjoy all shellfish on the South Beach Diet. However, the mercury content of fish is a growing concern. Canned tuna and swordfish should be limited for this reason.