To explain why humans can't live off caffeine and bacteria, the smaller one, can Rene Lynch try's to inform us why.
"Bacteria...get all the calories they need from it." Bacteria doesn't need much to live on. Humans need all their vitamins and minerals, unlike bacteria, to survive.
"We don't have the gears to digest the derivatives further." Human bodies take the caffeine as a source of energy but that's all. After that your body does nothing with it.
"Bacterium...it possesses several enzymes that do things to caffeine that we can't." Because the bacteria ca break down and use caffeine for energy and food it can live on it.
Bacteria had the capability to use caffeine in ways that humans cannot allowing them to live off caffeine.
The author answered the question "why bacteria, but not humans, can live off caffeine" Explaining to us all the reasons why even if we aren't satisfied with the turn out.
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