Our current state of health is almost entirely the result of 5 factors:
diet
physical activity
amount of sleep
DNA
the environment
Except for DNA (e.g. sex, race) and various aspects of our immediate environment, these facets of life are under our voluntary control. Altogether, they produce a net rate of wear and tear on the body or something referred to as stress.
Stress is ultimately responsible for our:
bodyweight
body composition
state of health
rate of aging
and your METABOLIC STATE (theres 7!)