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Erica Hill and Jeff Glor talk to Dr. Arthur Agaston, author of the famed South Beach Diet series, shares tips from his new book, "The South Beach Wake-Up Call: Why America Is Still Getting Fatter," on how to develop and stick to a healthy diet and lifestyle.

Doctors believe vitamins are best absorbed through a healthy diet, but some healthy foods may lose their nutrients over time.

A combination of two drugs —  along with advice regarding healthy diet and exercise — may be an effective treatment for obesity, a new study suggests.