SemiOnTopic: Some people in the comments equate "fast metabolism" and being skinny. How is that supposed to work? Metabolism is the conversion of energy from i

SemiOnTopic: Some people in the comments equate "fast metabolism" and being skinny. How is that supposed to work? Metabolism is the conversion of energy from incoming food into stored energy (fat) or used energy (heat, chemical processes). The speed of metabolism does not appear in any equilibrium (of which body weight is a statistic). If you've eaten food and it is not stored, the energy has to be expressed some other way - in what way do "fast metabolism" people express it?