Drink green tea before bed to burn calories while sleeping. Green tea will also increase your metabolism.
100 Mind-Blowing Metabolism Facts
People who eat whatever they want and stay slim have a slow metabolism, not fast. A skinny person tends to have less muscle mass than others, meaning their basal metabolic rate (BMR) is lower than those of a high muscle mass – this gives them a slow metabolism, not a fast one.
Animals with smaller bodies and faster metabolism see in slow motion.