_For 10 weeks, a Kansas State University human nutrition professor ate nothing but sugary snack cakes, candy bars, cookies, sweetened breakfast cereal, and chips. He lost 27 pounds. (He also "took a multivitamin pill and drank a protein shake daily. And he ate vegetables, typically a can of green beans or three to four celery stalks.") For a class project, Haub limited himself to less than 1,800 calories a day. A man of Haub's pre-dieting size usually consumes about 2,600 calories daily. So he followed a basic principle of weight loss: He consumed significantly fewer calories than he burned.