Last month, the U.S. Food and Drug Administration (FDA) released its official guidelines for safe levels of fumonisins in corn used for foods and animal feeds. Fumonisins are mycotoxins produced by species of Fusarium fungi that cause Fusarium ear rot. Fumonisins are the most common mycotoxins found in corn; because they are acutely toxic to animals (especially pigs and horses), and have been linked to increased cancer rates and other human health problems, the FDA feels that "human health risks associated with fumonisins are possible."