The American Medical Assn. recognized obesity as a disease in 2013. People with the chronic condition are at heightened risk of cardiovascular disease, Type 2 diabetes, 13 types of cancer, osteoarthritis, asthma and other health problems. Researchers have pegged the annual medical costs associated with obesity at $174 billion in the U.S. alone.
Some people with obesity are able to lose weight by changing their diets and burning more calories through exercise. But that doesn't work for people who have developed resistance to leptin, a hormone that suppresses appetite.
"If you try to lose weight with diet and exercise, your body is going to fight you," said Dr. Caroline Apovian, co-director of the Center for Weight Management and Wellness at Brigham and Women’s Hospital in Boston. "Your leptin levels go down, and when leptin goes down, a signal goes to the brain that you don’t have enough fat to survive." That prompts the release of another hormone, ghrelin, that triggers feelings of hunger.
Leptin resistance also makes exercise less worthwhile.
"Your body fights you by decreasing your total energy expenditure," Apovian said. "When your muscles work, they work more efficiently. If you want to lose 10 pounds, you’re going to get really, really hungry. And you can’t fight that. Your body thinks it’s starving to death."
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