How Metabolism/Metabolic Rate Affects Weight?

Your metabolism affects weight (maintenance, weight loss and weight gain), because it determines how many calories you need.

If you have a slower metabolism (meaning you burn calories more slowly) your body needs fewer calories. So you may find it more difficult to maintain or lose weight on an average calorie-controlled weight loss diet. In such a case, you may have to increase your level of physical activity, as this is the only effective way to raise your metabolism/metabolic rate.

If you have a faster metabolism (meaning you burn calories more quickly) your body needs more calories. So you may find it easier to maintain or lose weight on an average calorie-controlled weight loss diet.