I just want the caffeine, can't I just take caffeine supplements?Updated a month ago

You could, but your DNA doesn’t like it. Telomeres are the protective ends of our DNA (sort of like the plastic aglets on shoelaces) and as you age they shorten until eventually they become so short the cells they are within stop replicating and die.

This is bad news so you want to keep your telomeres as long as possible for as long as possible.

Three studies show coffee drinkers have longer telomeres. A study in 2016 in the UK on 5,000 NHS nurses showed coffee was significantly associated with longer telomeres. Better still, in 2017 another study showed coffee was associated with longer telomeres but caffeine from all other sources was associated with shorter telomeres.

So, get your caffeine from coffee to keep your DNA happy! And of course to gain all the other health benefits associated with coffee.