02/06/2013 12:19 pm ET Updated Apr 08, 2013

How Much Caffeine Is Too Much Caffeine?

When Matthew Penbross woke on a morning in August 2007--a day in which he'd be competing in motocross races near Port Macquarie, Australia--he wanted to be prepared. To improve his reaction speed on the start line, the 28-year-old began drinking Red Bull Energy Drinks soon after he rolled out of bed. All told, he would drink seven or eight of the caffeinated beverages within a seven-hour period.

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