People with extra weight may struggle to mount a robust immune response to the coronavirus — and may respond poorly to a vaccine.

A rigorous three-month study found that people lost little weight, and much of that may have been from muscle.

"The damage of this kind of diet is even more visible because of the pandemic," says a Oaxaca legislator who spearheaded a law against the sale of junk food and soda to minors. The idea is spreading.(Image credit: Mauricio Palos/Bloomberg via Getty Images)

Source: Centers for Disease Control and Prevention

Data shows people with certain chronic conditions are more likely to get severe COVID-19 symptoms. Why are they hit harder and what explains the disease's disproportionate affect on African Americans?(Image credit: Bloomberg via Getty Images)