Why is This The World's Favorite Drug? (Conversation Program)
Spotlight English: Advanced
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How Much Caffeine Is Too Much?
In 30 minutes, the caffeine affects the person most strongly. After about four and a half hours, your body has used about half of the amount of caffeine that you consumed. So this is a lot to do with, if you're drinking coffee at like 2 p.m., right? It's still in your body four and ahalf hours later when it's starting to be the time for you to go to bed. That can affect all of your biorhythms or circadian rhythms -- which are what we call our inner clock.
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