In the Trump administration’s quest to “Make America Healthy Again,” there may be no bigger target than ultraprocessed foods. Robert F. Kennedy Jr., the nation’s new health secretary, has cited “highly chemically processed foods” as a chief culprit behind an epidemic of chronic disease in the U.

It’s time to revamp the FDA’s “generally recognized as safe,” or GRAS, program that allows companies to add untested ingredients to food, the Health and Human Services secretary says. That may be difficult to do.

The practice Kennedy is targeting, known as “generally recognized as safe” (GRAS), can occur when companies self-certify the safety of a food additive.