Final answer:
Metabolic rate depends on factors such as age, sex, activity level, fuel consumption, and lean body mass. By modifying diet and exercise, one can increase both lean body mass and metabolic rate.
Step-by-step explanation:
The metabolic rate depends on various factors such as age, sex, activity level, fuel consumption, and lean body mass.
Aging can decrease the metabolic rate, while males tend to have a higher basal metabolic rate than females. Additionally, an individual's inherent metabolic rate is influenced by their genetics.
By modifying diet and exercise, one can increase both lean body mass and metabolic rate.