Dr. Nicholas Perricone refers to acai as his No. 1 superfood. Just like raspberries, this tropical berry is also very highly concentrated in anthocyanin, which helps the body produce adiponectin, a hormone that boosts your metabolism. Acai is also rich in healthy fats and fiber that "promote cardiovascular and digestive health," according to Dr. Perricone. Try it for yourself in this gorgeous acai bowl.