Metabolism, also known as calorie expenditure (the number of calories you burn in a given amount of time) refers to all the chemical processes in your body. The faster your metabolism, the more calories your body needs. It is the reason some people can eat a lot without gaining weight, while others seem to need less to accumulate fat.
Multiple factors affect metabolic rate, or the number of calories burned. These include age, muscle mass, body size, and physical activity. If you have a slow metabolism, fortunately, there are certain things you can do to boost your metabolism – check them out!