But I found this news story from the journal Science to be quite interesting.

Although cutting back on meat has many potential benefits, [food-security researchers] say the complexities of global markets and human food traditions could also produce some counterintuitive—and possibly counterproductive—results. "It's not this panacea that people have put forward," says Mark Rosegrant of the International Food Policy Research Institute (IFRPI) in Washington, D.C. One provocative forecast: If people in industrialized nations gave up half their meat, more Asian children could become malnourished.