Answer :
The way the REE changes how a person ages is through the reduction in fat-free mass.
What is resting energy expenditure?
This refers to the metabolism of the body that occurs when the body is at rest, due to homeostasis and biological equilibrium.
Hence, other factors that can lead to the aging process of a person based on this resting energy expenditure (REE) are the decrease in muscle mass, in relation to FFM and also the decrease in tissue metabolic rates.
Read more about metabolism here:
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