Coffee can help boost your metabolism, but diluting your cup of joe with coffee creams doesn’t. These popular java companions pack empty calories and have artificial sweeteners and flavors. Even if you put just a tablespoon of coffee creamer into your morning pick-me-up each day, the sugar and calories add up. In fact, a Korean study in the journal Nutrients found that people who use sugar and creamer with their coffee have a significantly higher risk of being overweight or obese than people who take their coffee black.