Page 1 of 4Caffeine: Most of us can't get through the day without it. Whether brewing a fresh pot of coffee in the morning, enjoying lunch with a refreshing can of cola, or recharging in the afternoon with an energy drink, we have many routines and food rituals revolving around this energizing substance. Found naturally in the leaves, seeds and fruits of more than 60 plants (including cocoa beans, kola nuts, guarana, yerba mate, green tea extract and tea leaves) and added to many other foods and beverages, caffeine is the world's most popular stimulant. In the US alone, more than 80% of adults consume it.
Like many commonly enjoyed foods and ingredients, we get mixed information about caffeine. Sometimes we hear it does a body good. Other times, we hear it's bad for us. Keep reading to uncover the truth about caffeine: how it works—and how it affects your health.
Why Caffeine Keeps You Charged
The brain produces a natural sedative called adenosine, which binds to the appropriate receptor sites in the brain, resulting in a drowsy feeling. Adenosine levels rise during daytime/waking hours, encouraging sleep in the evening. While sleeping, adenosine levels drop, so you awaken refreshed and raring to go.
Caffeine is similar in structure to adenosine. It temporarily binds to adenosine receptor sites in the brain. This prevents adenosine from attaching itself to the sites and thus, wards off fatigue. If you regularly consume caffeine, you might also discover that you build up a tolerance because the brain makes more receptor sites as a result. Therefore, you need more caffeine to attach to these new sites and get the same results.
While caffeine is one of the most studied ingredients in food supply, there is still great confusion regarding its effects on health. For years caffeine has been included on the U.S. Food and Drug Administration's list of substances that are "generally recognized as safe" (GRAS) list. Extensive research has been conducted on numerous health aspects of caffeine consumption. Here is a synopsis of the findings regarding caffeine and health.
5 Health Benefits of Caffeine