Rheumatoid arthritis is an autoimmune disease that can cause painful inflammation in the fingers and other joints. Richard Rudisill/iStockphoto.com hide caption

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New York City food carts would also be affected by Mayor Michael Bloomberg's proposal to ban sugary drinks 16 oz. and larger. Andrew Burton/Getty Images hide caption

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Karlton Hill, 15, was diagnosed with diabetes when he was 12. He works hard to manage the disease: He jogs and does pushups every day; he takes metformin is very careful about what he eats. Leslie Capo/LSU Health Sciences Center hide caption

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It's not clear if diet soft drinks are the healthiest choice. ASSOCIATED PRESS hide caption

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Studies show that friends and family gain weight — and lose weight — together. Sean Locke/iStockphoto.com hide caption

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The FDA hasn't approved a new weight-loss drug since 1999. In the meantime, Americans' waistlines have continued to grow. M. Spencer Green/AP hide caption

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