Current Connection "It's all in the rings"

In Veronique Greenwood's aritcle "Why Bacteria, But Not Humans, Can Live on Caffeine: It's all in the rings," she informs us on the reasons why this newly found bacterium can live on caffeine alone but we can not.
She states that "we, and the caffeine-loving bacterim, need nutrients like vitamins and minerals as well. But those are for use in biological reactions rather than as an energy source." This means that the bacteria do not need the energy that we need but they need the same nutrients for reactions that occur naturally inside of them. Since the caffeine has those nutrients they can still have those reactions occur. But we need the nutrients for energy and there is simply not enough in caffeine to use it alone.
We "humans are fairly limited in terms of what the body can digest," "alot of the molecules we eat, we don't use." So yes caffeine would be a substainable diet if it had the things in it that our complicated bodies could digest to use in our everyday lifes.
The reason we can not digest this molecule is because "we don't have the gear to digest derivatives further." We can only take away the CH3 in caffeine. leaving the few parts the we pee out if we can connect an oxygen to the molecule thats left.
I see something about coffee every other day because Mrs. Gilmore's classroom is focused around a cafe setting, and what do they serve at cafes? Coffee, that is it, and what does coffee have in it? Cafeine. It contains alot of cafeine unless you get that nasty decafe coffee.
Do you live off cafeine? If so you might want to rethink the way you live and get some of the foods and drinks your body can digest and use to help you stay healthy.