Mark Haub, a professor at Kansas State University, followed a junk food diet for ten weeks to make the point that calories are all that really matter for weight, and tracked his progress on Facebook for the world to see. He ate a Twinkie every three hours instead of normal meals, and rounded out the diet with chips, sugar-rich cereal, and cookies. The diet sounds like a health disaster (and I’m not recommending it!), but the key piece of the puzzle was the calories: Haub limited himself to 1,800 kcal per day, well below his daily energy expenditure. At the end of ten weeks, he had lost
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