Huffington Post: The world's reliance on narrow range of foods will lead to an increase in diseases like diabetes and a food supply that is more vulnerable to environmental changes like global warming, a new study warns. Human diets around the globe have become more and more similar throughout the past five decades, to the point that people currently get 90 percent of their calories, protein and fat from the same 50 crops, according to a study published Monday in the Proceedings of the National Academy of Sciences....