There's lots of evidence for positive influences of Caffeine on the body (some negative as well), especially the brain. In particular, there's active and promising research on the neuroprotective effects for Alzheimer's [1] and Parkinson's [2].

"There is a wealth of accumulating biological, epidemiological and clinical evidence to support the further investigation of selective adenosine A2A antagonists, as well as caffeine, as promising candidate therapeutics to fill the unmet need for disease modification of PD."

1: https://www.mdpi.com/2218-273X/13/6/967 2: https://pubmed.ncbi.nlm.nih.gov/33349580/