- Changes in estrogen and progesterone levels relate to the onset of menopause (in both men and women), the change most women associate with aging.
- Changes in testosterone affect our outlook on life (our drive), the disappearance of muscle mass, and the shrinkage of our bodies associated with old age.
- Growth hormone affects everything from muscle/fat ratios to the graying of hair.
- When melatonin levels drop as we age, it affects things as diverse as how well we sleep to how strong our immune system is -- even how resistant we are to cancer.
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