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  Veronique Greenwood, the author of Why Bacteria, But Not Humans, Can Live On Caffeine, explains 1) what caffeine does in bodies 2) why caffeine can be bad and 3) why do we get energy from caffeine.

"...it processes several enzymes... it breaks down the two carbon and nitrogen rings at the molecule's core." Anytime people drink "caffeine-packed beverages," this process happens to be present in the human body.

"When the molecule seeps into the brain and interferes with neurotransmitters, blood pressure rises..." When blood pressure rises, we have a problem; I find this information amazing because caffeine can do all of this single handed.

"...most of the molecules in nature are inaccessible to human digestion." I am sure of how we get the molecules to produce energy for us; the molecules are rare so our bodies try to absorb as much as we can get.

I used to drink "caffeine-packed beverages." I saw the effects of caffeine and immediately quit drinking the "caffeine-packed beverages." I remember reading an article about the horrors of energy drinks back in elementary school for a health awareness issue we had in the school. I can probably say about ninety-five percent of people in the world consume caffeine everyday.

Veronique Greenwood does a great job on showing us the effects of caffeine and what caffeine physically does to our bodies.