Health Secretary Robert F. Kennedy Jr. is promoting food as medicine, but experts say he's overstating what diet can do for serious illness. He's said diet can cure schizophrenia and diabetes, and let people rid themselves of bipolar disorder diagnoses. Researchers say Kennedy is exaggerating current evidence about the real and promising role that food can play in managing illness. Some public health advocates say they're concerned his imprecise language could drive people to self-medicate with food while avoiding proven treatments. But at least one expert in diet-related conditions says he welcomes more attention on how diet can improve chronic disease.