Research suggests that eating the same thing every day may help you lose weight. In one study, women who ate macaroni cheese for lunch every day for 5 days consumed 100 fewer calories than usual over the course of the week, whilst those who ate it just once a week for 5 weeks consumed 30 additional calories with each serving. Psychologists believe that eating the same thing every day results in psychological "habituation" (or boredom), which tends to reduce calorie intake. "More food variety universally leads to more food intake," says Dr Susan Roberts, director of the Energy Metabolism Laboratory at Tufts University.