Next time you're preparing burgers for the grill, swap in chopped, sauteed mushrooms for half of the beef. According to a John Hopkins University study, dieters consumed 123 fewer calories per day and lost an average of 7 pounds and 2.6 inches from their waist in six months just by eating 1 cup of mushrooms in place of meat daily. And thanks to the mushrooms' hunger-satiating protein and metabolism-boosting phytonutrients (all for just 19 calories per cup) a few FIRST readers reported this strategy helped them lose even faster—up to 3 pounds per week! Don't like mushrooms? No problem. Just pulse them in a food processor so that they're extra fine before you mix them with the meat—you'll barely taste them!