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Researchers at the National Institute on Aging analyzed data from 574 men ages 32 to 87 who had participated in the Baltimore Longitudinal Study of Aging. The team measured levels of "free" testosterone in the blood.
They observed that higher levels of free testosterone seemed to protect men from Alzheimer's. The team reports that for every 50% increase in free testosterone in the blood, there was a 26% reduction in the risk of developing the disease.
Testosterone is the hormone primarily responsible for normal growth and development of male sex and reproductive organs, including the penis, testicles, scrotum, prostate, and seminal vesicles. It facilitates the development of secondary male sex characteristics such as musculature, bone mass, fat distribution, hair patterns, laryngeal enlargement, and vocal chord thickening. Additionally, normal testosterone levels maintain energy level, healthy mood, fertility, and sexual desire. In short, this is what TCM calls Jing.
However Jing's influence also extends into the central nervous system or what TCM calls the "Sea of Marrow". That's the brain, the Sea of Marrow. Should the Jing become deficient, as it often does in old age, the Sea of Marrow can dry up over so slightly giving rise to memory problems and in more severe cases, Alzeimer's disease.
So, what does this research really discover? It discovers the relationship between Jing and the Brain, long understood in TCM circles.