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Human biology is ill-suited for the modern world. Junk food is cheap and delicious; firms spend billions advertising it. Therefore, people consume more calories than they spend. Two-thirds of Americans are overweight or obese. Developing countries are catching up. In China nearly 30% of adults are too wide. This poses a grave challenge to health systems. Obesity increases the risk of cardiovascular disease, diabetes, liver disease, joint troubles and even some cancers. I believe our government should make great efforts to deal with this problem. Governments cannot force people to eat vegetables, but they can certainly change subsidies to make vegetables cheaper. They can ensure that school lunches are healthy and that children have time to run around. They can set clear standards for nutrition labels, so that educated consumers will shop wisely and demand healthier products. Governments should also consider imposing a tax on soda. The syrupy stuff is a main driver of obesity and, unlike a hamburger, has no nutritional value. A soda tax is far less intrusive of an individual’s liberty than forcing him to wear a seat belt.