IIRC, no known biological process uses the element aluminum. I’ve also read it can affect the brain - not that it would stand a chance against my lead exposure - but I usually avoid kegs and cans, preferring bottled beer instead. :-)
Eddie: Every time Catherine would turn on the microwave, I’d piss my pants and forget who I was for about half an hour.
Aluminum cans and kegs are coated on the inside, no bare aluminum. Kegs have gone to stainless steel because recycling thieve liked aluminum.
I also avoid aluminum cans. I can taste the ions. Supposedly, “experts” favor cans over bottles, since the former are more air-tight, and light-proof; bottled always tastes better to me, and I do not get the aluminum.
I have studied nutrition for thirty years. As far as I know, aluminum indeed plays no role in human physiological processes.