when is a 200-calorie meal fattening? It depends on what time you eat it.Dr.Franz Halberh, a professor of laboratory medicine and pathology at theUniversity of Minnesota,probed this mystery in a study conducted a few years ago.Each day for a week,he fed six volunteers a single meal,eaten at breakfast time, which consisted of 2000 calories.Then he gave the same participants the identical 2000-calorie meal as dinner for a week.But on the breakfast diet than on the dinner diet.Dr.Halbeg's conclusion is that a calorie is not the same at breakfast as it is at dinner.