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Its sleep everyone needs. Lack of sleep which is culturally forced onto a group of people with things like school hours, college hours, office hours, shift work, is the fastest most consistently subtle way to ruin people's health and keep them in check.

You'd be surprised at how many people lose weight just by sleeping better.

When was the last time you jumped out of bed with a spring in your step?

There is also such a thing as diet induced obesity.

In North America, due to its vastness, everyone has drive somewhere, how on earth can people get their exercise if they are driving everywhere? Europe, is compact enough so that people can walk and get stuff, but the food legislation will play its part in creating obesity.