Scientists found that people who consumed more calcium were leaner than those who didn’t. In one study, those who consumed the most dairy products were 80 percent less likely to be obese and have a lower body mass index.

The dairy industry couldn’t buy publicity like this, so they organized a major advertising campaign to exploit the research.

After careful analysis of the data, scientists found no evidence that calcium supplements or high intake of dairy foods promotes weight loss.

Consequently, the Federal Trade Commission asked the National Dairy Council to cancel an ad campaign heralding the weight-loss properties of dairy foods. The new United States Department of Agriculture Dietary Guidelines recommends consumption of 3 cups a day of low-fat or fat-free dairy products.

It may be a good idea to add these products to your diet, specifically in a form of yogurt, but they do not appear to promote weight loss. [sources: The New York Times, Fitness RX]