H/T Lot’s Wife
This recently published paper shows that consistent coffee drinkers enjoy reduced risk of infection. Coffee’s polyphenols and antioxidants appear to up-regulate the immune system. Caffeinated and decaffeinated coffee showed similar results. Extensive details here:
Of course, water quality is crucial. If you share the assertion that coffee is best brewed with clean water, Fox water is preferred. Arguably a source of some of the cleanest water in the region.
Listed contaminates in Fairbanks city water:
https://www.myutility.us/akwater/water-safety/water-quality-reports