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.

Experts say vitamin A can mitigate measles but does not protect those who are unvaccinated from getting the disease, and RFK Jr. says immunization is a "freedom of choice."