The politics of food is changing fast. In rich countries, obesity is now a more serious problem than hunger. Consumers once satisfied with cheap and convenient food now want food that is also safe, nutritious, fresh, and grown by local farmers using fewer chemicals. Heavily subsidized and underregulated commercial farmers are facing stronger push back from environmentalists and consumer activists, and food companies are under the microscope. Meanwhile, agricultural success in Asia has spurred income growth and dietary enrichment, but agricultural failure in Africa has left one-third of all...

Compared to other wealthy countries, America stands out as a gluttonous over-consumer of both food and fuel. The United States boasts an obesity prevalence double the industrial world average, and per capita carbon emissions twice the average for Europe. Still worse, the policy steps taken by America in response to obesity and climate change have so far been the weakest in the industrial world. These aspects of America's exceptionalism are nothing to be proud of.

Is it possible that America is hard-wired to consume too much food and fuel? Unfortunately, yes, says Robert Paarlberg in...