The difference is that you don't have to suffer from an addiction or a mental problem to be obese. That's not really the case with the other examples since they're by definition, addictions. While some people eat to fill emotional voids, most people are overweight simply because they have poor diets and get little to no physical activity. There's a reason the United States has an obesity rates 3 times that of Sweden and 10 times that of Japan and it's because of the prevailing lifestyle, not because that many more people suffer from emotional problems in the United States compared to other nations.
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