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I actually think a big part of the reason is due to the whole "low fat" craze that was pushed down our throats over the past few decades. The government and all the health officials started telling people that fat was bad. Companies went out and made "low fat" products that were stacked with sugar and corn syrup. Everyone thought they were being healthy when in fact they weren't. Fat isn't bad, certain types of fat are.
Another reason is the fact that it's easier and cheaper to eat unhealthy. Fruit and lean meats are expensive. Good meals take time to make. Fast food has gotten so fast and so easy that it makes a tempting alternative. Marketing has gotten savvy, people are confused and uneducated on health issues.
And this isn't just a problem in the US. The UK is seeing a huge increase in obesity over the past few years. Canada has also had large increases over the past couple decades. While the US has the highest numbers, other countries are catching up quick as globalization takes over.
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