"Higher metabolism" refers to the body's ability to burn calories and convert food into energy at a faster rate. It means your body's engine works more efficiently, helping you stay active and potentially burn more fat. Full definition
Being born with high metabolism has its own pros and cons. (gainingtactics.com)
The thing is, there are some people who have very high metabolism who really do have a hard time putting on weight and muscle mass. (massgainsource.com)
Higher metabolism rates break down food quicker, transforming it into energy instead of fat. (thelingeriediet.com)