If you want to boost your metabolism and hopefully burn more fat, add cinnamon to your coffee instead of sugar. Researchers at the University of Michigan exposed human fat cells to cinnamaldehyde, the substance that gives cinnamon its unique taste and smell. They observed the fat cells expressed more genes and enzymes that caused them to burn fat instead of storing it. Instead of adding sugar, cream or milk to your daily coffee, try cinnamon. You might enjoy it, and it might help your waistline.