An anonymous reader writes: Freakonomics strikes again. The NY Post writes, ""What is “the cheapest, most nutritious and bountiful food that has ever existed in human history” Hint: It has 390 calories. It contains 23g, or half a daily serving, of protein, plus 7% of daily fiber, 20% of daily calcium and so on. Also, you can get it in 14,000 locations in the US and it usually costs $1. Presenting one of the unsung wonders of modern life, the McDonald’s McDouble cheeseburger. The argument above was made by a commenter on the Freakonomics blog (with podcast) run by economics writer Stephen Dubner and professor Steven Leavitt, who co-wrote the million-selling books on the hidden side of everything." Freakonomics, "FWIW, McDonald’s has 34,000 restaurants in 118 countries, serving serving nearly 69 million a day. In the U.S., 85 percent of households are “food secure”; The Economist ranks the U.S. No. 1 in the world on this dimension."