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Old 07-19-2007, 09:47 AM   #5
Kevin ONeall
Member Kevin ONeall is offline
 
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Join Date: Jun 2007
Location: Rock Springs  WY
Posts: 11
At low heart rates the body is burning mostly fat. At high heart rates the body is burning mostly sugar. Training shifts the equation towards fat burning. I mean you begin to be able to burn fat at higher heart rates. But you never get to the point of burning just fat. Even if you eat a ketogenic diet, the body makes glucose via gluconeogenesis.

For the Zone diet, it's all about controlling insulin. But when you're exercising at extreme heart rates the body still needs sugar. IF you're not giving it enough it makes its own by catabolizing proteins. So it's best to have sugar on hand to ensure you don't hit the blood sugar wall. It all gets used up by the exercise. I prefer Hammergel as a fast energy source.
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