A ghost.Metabolism is the set of chemical reactions that break down the food we eat into energy and muscle. Though many people think that they will lose weight if they speed up their metabolism, this isn't necessarily true. Here's what you need to know about the complicated relationship between metabolism and weight-loss.When people refer to metabolism being "fast" or "slow" what they are really referring to is a measure of Basal Metabolic Rate (BMR). BMR determines the number of passive calories that you burn — these are the calories that your body uses up while at rest. A...…A ghost.Metabolism is the set of chemical reactions that break down the food we eat into energy and muscle. Though many people think that they will lose weight if they speed up their metabolism, this isn't necessarily true. Here's what you need to know about the complicated relationship between metabolism and weight-loss.When people refer to metabolism being "fast" or "slow" what they are really referring to is a measure of Basal Metabolic Rate (BMR). BMR determines the number of passive calories that you burn — these are the calories that your body uses up while at rest. A...WW…