Lots of people rely on caffeine to wake them up or to keep them going. Caffeine stimulates the central nervous system, making you feel less tired, and improving your focus. For most people the normal amount of caffeine (per day) is about 200-300 mg or about two to four cups of coffee. That amount isn't harmful but, once you start ingesting about 500-600 mg (per day) you might start noticing issues. Things including: insomnia, nervousness, restlessness, irritability, stomach ache, fast heartbeat, and muscle tremors. Some people are more sensitive caffeine than others. Your sensitivity to caffeine might have to do with how much caffeine you ingest regularly. Other factors may include body mass, age, medication, and pre-existing conditions such as anxiety. Research also shows that men are more susceptible to the effects of caffeine than women.
I never knew that one gender would be more sensitive to caffeine than the other. I also never knew that there was a certain amount of caffeine you could have before you started noticing major side effects. I always just thought that once you were hyper that was the point at which you should stop drinking caffeine. I think its interesting how Americans are so addicted to coffee. I have a friend who tried to quit drinking coffee for a few weeks; she wouldn't do anything until about noon or one in the afternoon. I just find the effects of caffeine interesting.
http://www.mayoclinic.com/health/caffeine/NU00600
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