Just when you thought mass-produced beef couldn’t get less appetizing (remember the “pink slime” hamburger controversy?), along comes Zilmax, a new growth drug being fed to feedlot cattle across the country. According to author Christopher Leonard, Zilmax was originally developed to treat asthma in humans. In feedlot-raised cattle, it produces faster muscle growth…and more profits. It’s FDA approved, but according to Leonard, it makes steak tougher, less flavorful and less juicy than beef from untreated cattle. Beef McNuggets anyone? Read the full article from the San Jose Mercury News, and a longer article in the Chronicle of Higher Education.