Obesity is a major and growing problem around the world, but especially in the U.S., where more than 40% of adults and about 20% of children now meet the criteria for what doctors say has become an intractable chronic disease.
Rates of the disease have soared in recent decades, spurred by the complex interaction of genes that make people more likely to store food as fat, a food system that provides easy and cheap access to processed treats explicitly designed to be overconsumed, and social settings that limit access to healthy options and exercise for many people.
