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Lead Stories: Thursday, November 20, 2008

Does leucine effectively increase endurance? Is it safe?

Posted February 19th, 2007 at 8:00 AM by Hariz Siddiqui

Section: Nutrition, Supplements

A study from Australia showed that leucine helps athletes exercise longer (European Journal of Applied Physiology, August 2006), so now athletes are lining up to waste their money on supplements that are no more effective than any other source of sugar.

Leucine is a branched chain amino acid that the liver readily converts to sugar. Your body needs extra sugar during endurance exercise, and it doesn’t care where it gets it. Your brain gets more than 95 percent of its energy from sugar in your bloodstream. It cannot store extra fuel in its cells.

However, there is only enough sugar in your bloodstream to last three minutes. To prevent blood-sugar levels from dropping, your liver constantly releases sugar from its cells into your bloodstream. There is only enough sugar in your liver to last up to 12 hours at rest, and you run out of liver sugar much faster than that when you exercise.
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Eating carbohydrates and protein for muscle growth

Posted January 6th, 2007 at 6:02 AM by Martin Kennedy

Section: Nutrition, Health & Fitness, Exercise

If you want to become very strong, you should lift heavy weights, eat carbohydrates before you lift and eat plenty of protein afterwards.

Normal amounts of insulin help muscles grow, and eating carbohydrates causes your blood sugar to rise, which, in turn, causes your pancreas to release insulin. Taking in large amounts of protein after a workout helps muscles to recover faster from hard exercise, so you can do more hard work and grow larger and stronger muscles (Journal of Physiology).
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