A new study in the International Journal of Obesity warns that when you eat is just as important for weight loss as the kinds of food you eat. Over two weeks, the study followed two groups: “early eaters” (who ate lunch before 3 p.m.) and “late eaters” (who ate lunch after 3 p.m.). There were no other differences between the groups in terms of caloric intake, energy expenditure, or sleep duration. The result? The late eaters burned calories and lost weight at a significantly slower overall rate. Our advice? Make your lunch reservations for before noon.