Dieting Fails, so why don't they look for other solutions? The definition of insanity is continuing to do what does not work. Notice the severe obesity numbers.
Low Chance of Obese People Recovering Normal Body Weight
"The chance of an obese person attaining normal body weight is 1 in 210 for men and 1 in 124 for women, increasing to 1 in 1,290 for men and 1 in 677 for women with severe obesity, according to a study of UK health records led by King's College London. The findings, published in the American Journal of Public Health, suggest that current weight management programmes focused on dieting and exercise are not effective in tackling obesity at population level."
See too: Americans Aren't Dieting Anymore