Hitting the drive-through every once in a while probablywon't lead to a supersize you, but make those cheeseburgerruns a habit and you'll see the evidence on the scale. Onaverage, people tend to be about 1.5 pounds heavier forevery fast-food meal they eat per week, according to a newstudy from Temple University. Researchers found that peoplewho ate fast-food meals three to six times a week had a bodymass index (BMI) nearly a full point higher than the BMI ofpeople who rarely downed the fatty fare. Ask yourself: Is nothaving to wash a few dinner dishes worth the extra weight?