At restaurants, a dollar puts more calories on our plates than ever before, because restaurant meals usually have more calorie than what we prepare at home, so people who eat out more frequently have higher rates of obesity than those who eat out less.

　　If you're obese, you lack self-control.

　　Research shows that if we are faced with too much information, we have a tendency to make poor dietary choices. Our world has become so rich in temptation that we can be led to consume too much in ways we can't understand. Even the most vigilant(警觉的) people may not be up to the task of controlling themselves.

　　Lack of access to fresh fruits and vegetables is responsible for obesity.

　　Although the US Department of Agriculture estimates that fewer than 5 percent of Americans live in the “ food deserts”, about 65 percent of the nation's population is overweight or obese. For most of us, obesity is not related to access to more fresh fruits and vegetables, but to the choices we make in supermarkets.

　　The problem is not that we eat too much, but that we don't exercise.

　　Michelle Obama's “Let's Move” campaign is based on the idea that if kids exercise more, childhood obesity rates will decrease. But there was no significant decrease in physical activity levels as obesity rates climbed in the 1980s and 1990s. In fact, although a drop in work-related physical activity may account for up to 100 fewer calories burned, leisure physical activity appears to have increased. The problem is that we eat too much.

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