Factors that affect your metabolism

body size and composition

if you weigh more or have muscle mass,you will burn more calories, even at rest. So people who weigh more are more likely to have a faster metabolic rate not a slower one because a portion of excess weight is muscle tissue

Gender

if you’re a man, you probably have less body fat and more muscle mass than does a woman of the same age,so you burn more calories.

Age

as you get older, your muscle mass decreases, which slows down the rate at which you burn calories

Genetic

Genetic also play or role in whether you have a slower or faster metabolism and some genetic disorders can also affect your metabolism.

Diet

certain aspects of your diet can also affect metabolism for instance if you don’t have enough iodine for optimal thyroid function it can slow down your metabolism.

Muscle mass

Muscle requires more energy to function than fat. so the more muscle tissue you carry the more energy you body needs just to exist. while most forms of exercise will help boost muscle,resistance or strength training is most effective

Hormonal factors

hormonal imbalances caused by certain conditions, including hypo and hyperthyroidism can affect your metabolism

Environmental factors

the weather can also have an effect on your metabolism if it is very cold or very hot your body has to work harder to maintain it’s normal temperature and that increases the metabolic rate