In a study of over 61,000 veterans, those who meditated had lower rates of high cholesterol, high blood pressure, diabetes, stroke, and coronary artery disease, compared with those who did not meditate.

Older adults with a reduced sense of smell are more likely to develop dementia. Sensory impairment, which also includes loss of hearing, vision, or touch, accelerates cognitive decline directly or indirectly.

After exercise, the liver secretes the protein Gpld1, which improves cognitive function in aging mice. Overproducing the amount of Gpld1 in mice conferred the same brain benefits as exercise.

Transfers of the immune cell eosinophils from young mice into old mice resolved inflammation, rejuvenated the immune system, and improved body composition and physical fitness.