Our diet is indeed killing us, and it's killing the planet too. Earlier this month, the Centers for Disease Control and Prevention in Atlanta released a study revealing that nearly 27% of Americans are now considered obese (that is, more than 20% above their ideal weight), and in nine states, the obesity rate tops 30%. We eat way too much meat - up to 220 lb. per year for every man, woman and child in the U.S. - and only 14% of us consume our recommended five servings of fruits and vegetables per day. Our processed food is dense with salt and swimming in high-fructose corn syrup, two flavors we can't resist. Currently, enough food is manufactured in the U.S. for every American to consume 3,800 calories per day - we need only 2,350 in a healthy diet. Keeping the food flowing - and the prices low enough for people to continue buying it - requires a lot of industrial-engineering tricks, and those have knock-on effects of their own. Up to 10 million tons of chemical fertilizer per year are poured onto fields to cultivate corn alone, for example, which has increased yields 23% from 1990 to 2009 but has led to toxic runoffs that are poisoning the beleaguered Gulf of Mexico.