McDonald's as humanitarian?

Here's an unconventional perspective on the humble McDonald's cheeseburger. 

"It has been my gut-level (sorry, pun) feeling for a while now that the McDonald’s McDouble, at 390 Calories, 23g (half a daily serving) of protein, 7% of daily fiber, 20% of daily calcium and iron, etc., is the cheapest, most nutritious, and bountiful food that has ever existed in human history."

 Freakonomics