Low-fat diets were associated with lower serum testosterone levels in a study of over 3,000 men. Testosterone deficiency is linked to low energy and libido and reduced bone mineral density.

Drinking green tea 3 times per week was linked to a 56% lower risk of fatal heart disease or stroke and 29% decreased risk of all-cause death, likely due to the polyphenols and antioxidants.

Beneficial gut microbes from short-chain fatty acids (SCFA) improved recovery post-stroke in a mouse study. Mice who got SCFAs had better motor skills and increased nerve cell growth.

Frontotemporal dementia (FTD) is the most common cause of dementia in those under 65 and has a strong genetic component. Physical and cognitive exercises may be the best way to slow FTD.