The South Beach Diet is a popular fad diet developed by Arthur Agatston and promoted in a best-selling 2003 book. It emphasizes eating high-fiber, low-glycemic carbohydrates, unsaturated fats, and lean protein, and categorizes carbohydrates and fats as "good" or "bad". Like other fad diets, it may have elements which are generally recognized as sensible, but it promises benefits not backed by supporting evidence or sound science.