The best way to to sum up what it does is it keeps you awake and alert but let's break that down even further.

Within the first 10 minutes…

The caffeine within the coffee begins to enter your bloodstream raising your heart rate, and thus your blood pressure begins to rise as well.

After 20 minutes…

The caffeine is able to help you feel less tired by connecting to your brains adenosine receptors. When adenosine is “received by your adenosine receptors you become less active and more sleepy. However, with caffeine connects, adenosine cannot enter making you therefore less sleepy!

At the 30 minute mark…

Your body starts to produce more adrenaline. This leads to “sharper vision” essentially because it makes your pupils dilate a little!

Reaching 40 minutes…

The level of serotonin begins to increase in your body, which might account why some more “grouchy” morning people experience a mood lift after their morning coffee! Serotonin also improves the functioning of your motor neurons, which in turn boosts your muscle strength!

After four hours…

Coffee has the ability to increase the rate at which your cells release energy! Stimulating the stomach acids for digestion; your body additionally begins to break down fats at this point, even if you are remaining sedentary!

After six hours…

This is where things are not so cute anymore. After six hours caffeine begins to have a diuretic effect. What this means is that your body begins to want to not just purge water, but also some essential vitamins and minerals. In some individuals this can lead to slight disorders of calcium metabolism.

As you can see there is more to drinking coffee than just the way it taste or the initial buzz you get. IT keeps you going and alert so add this item to your prepper list because it really does help.