Lady Gaga, who put on some weight recently, announced in September that she was "proud at any size." Having a healthy body image is great, and in the weight-obsessed entertainment world, achieving it is no easy feat. What's not great is if weight gain leads to obesity, with all the health issues that brings. According to the World Health Organization, unless things change quickly there will be 65 million more obese people in the U.S. by 2030. Already, the annual cost of obesity-related illnesses comes to more than $190 billion, according to the U.S. Institute of Medicine. Here's what Americans are doing to battle the bulge and what it costs.