Products with soy protein can be good substitutes for animal products because, unlike some other beans, soy offers a "complete" protein profile. Soybeans contain all the amino acids essential to human nutrition, which must be supplied in the diet because they cannot be synthesized by the human body. Soy protein products can replace animal-based foods-which also have complete proteins but tend to contain more fat, especially saturated fat-without requiring major adjustments elsewhere in the diet.

While foreign cultures, especially Asians, have used soy extensively for centuries, mainstream America has been slow to move dietary soy beyond a niche market status. In the United States, soybean is a huge cash crop, but the product is used largely as livestock feed.

With the increased demand for information on healthy diets, that may be changing. Sales of soy products are up and are projected to increase, due in part, say industry officials, to the FDA-approved health claim. (U.S. retail sales of soy foods were $.852 billion in 1992 and are projected to rise to $3.714 billion in 2002. See attached chart.) "We've seen this before with other claims FDA has approved," says Brian Sansoni, senior manager for public policy at the Grocery Manufacturers of America. "It brings attention to products; there are newspaper and TV stories and information on the Internet."

To qualify for the health claim, foods must contain at least 6.25 grams of soy protein per serving and fit other criteria, such as being low in fat, cholesterol, and sodium. The claim is similar to others the agency has approved in recent years to indicate heart benefits, including claims for the cholesterol-lowering effects of soluble fiber in oat bran and psyllium seeds.

The FDA has determined that diets with four daily soy servings can reduce levels of low-density lipoproteins (LDLs), the so-called "bad cholesterol" that builds up in blood vessels, by as much as 10 percent. This number is significant because heart experts generally agree that a 1 percent drop in total cholesterol can equal a 2 percent drop in heart disease risk. Heart disease kills more Americans than any other illness. Disorders of the heart and blood vessels, including stroke, cause nearly 1 million deaths yearly.

The FDA has allowed the health claim for soy protein in response to a petition by Protein Technologies International Inc., a leading soy producer that tracks its origins to soybean studies sponsored by Henry Ford

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