Latest Issue of Science News


Soy-protein quality versus quantity

Soybeans contain growth-promoting and heart-protecting proteins. To boost these benefits, the United Soybean Board, an industry group based in Chesterfield, Mo., has been pushing growers to develop soy with even higher protein yields. A new study suggests that such an achievement might come at a serious price: a reduction in the protein's quality.

A limitation of soy protein has always been that it contains too few sulfur-based amino acids, which are particularly important for growing children and for livestock. That's why soy-based feed and foods are typically supplemented with an expensive sulfur-based amino acid such as methionine, explains Hari B. Krishnan of the U.S. Agricultural Research Service plant genetics unit in Columbia, Mo.

Note: To comment, Science News subscribing members must now establish a separate login relationship with Disqus. Click the Disqus icon below, enter your e-mail and click “forgot password” to reset your password. You may also log into Disqus using Facebook, Twitter or Google.

This article is available only to subscribing members. Join SSP today or Log in.