Juice: Granny says Raw carrot or lettuce juice has calming properties and helps when you are stressed out., says Granny. Science has now given weight to this theory. Apparently, it is the magnesium ( present in moderate amounts in these veggies ) that helps by regulating serotonin balance.The antioxidants are a bonus. Drink 2 to 3 cups a day if you are a worrisome character.