So as you may or may not know is that the majority of obese people in the United States are other in poverty or really dumb. In most cases both. So what we do is this!
Instead of the nutrition facts on the back of food that they obviously don't look at, we label the food in big print thats very visible
Healthy
Un-healthy
Also we make a program where the poverty stricken people on food stamps can afford to eat healthy. There just solved the obesity problem. You're welcome.
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We could genetically engineer a monster that eats people above a certain BMI. Then we just turn it lose after a specified amount of time. Give everyone 2 years, and then release it. You will either be eaten, or will burn so many calories from fighting them that you eventually lose the weight.