I totally understand how someone can survive on that, but the idea does baffle me. According to my fitbit data, I walk no less than 45 miles a week at work, lift 4x a week, and now pokemon go has consumed my free time. If I eat a modest 2500 calories a day, I'm at least 1,000 calories below my TDEE.  Then again, I'm a tall dude with an extremely high activity level. Also, I like eating 2 big meals a day, instead of spreading it out throughout the day. So a 1,200 calorie meal really is not far-fetched or disgusting at all. That could easily just be a burger and a beer.