But in many cases vendors know very little about the diet products they sell, much less the science behind them.

Although numerous studies show that the vast majority of people regain weight after dieting, the market for diet products and programs is still booming.

Marketers of diet products must support what they say with sound science.

Americans continue to spend over $33 billion on diet products and programs.

In addition to the popular mainstream programs mentioned above, there are a large number of diet products and programs available on the internet.

But some analysts are skeptical that the sales will continue because diet products tend to be fads.

But claims for diet products that promise weight loss without sacrifice or effort are bogus and, in some cases, dangerous.

These international awards are assigned to beverages, foods, cosmetics and diet products, which stand out for their quality.

The agency said the other ingredients had not been proven effective in diet products.

"The use of ma huang as a diet product is most distressing to me," he said.