There are more than 3,000 diet books on the market, written by everyone from celebrity advisers to self-proclaimed experts with credible credentials. Many if not most of these plans promise quick, dramatic results, but the reality is that few are based on legitimate science. Old rules are out, e.g., 1 pound of fat equals 3500 calories so a deficit of 500 calories a day will result in one pound of fat lost in a week. This simple graph provides a more realistic way to think about weight loss.
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