First Endurance Sets New Fuel Rules For Athletes

  • By Julia Polloreno
  • Published Dec 6, 2013
  • Updated Jan 29, 2016 at 3:54 PM UTC

Rule 4

Happy stomach + fast delivery of sustained energy = glucose.

“Your body burns glucose — this is physiology 101 — and that is its preferred food,” says Kunz. “If your body is burning glucose, it’s going fast. We don’t buy into anything that says you should have slow-absorbing calories for long periods of time, and EFS is designed so everything in it is absorbed really fast.” The key: the three carbohydrates — glucose, sucrose and maltodextrin — are high-glycemic, fast absorbing and keep you from dipping into your precious glycogen stores. The whole goal in your fueling plan, whether sprint or Ironman, is to spare glycogen. Once you’ve run out of glycogen, you bonk. “With EFS you’re able to keep glucose up and race at a very high level from beginning to end,” says Kunz. “We’ve seen dramatic changes in all our athletes.”

But be weary of taking in too much sugar into your gut too quickly, says Antonucci, as that forces water to rush into your gut and “it doesn’t take long to figure out what happens then — the athlete is looking for a quiet, secluded spot to use as a Porta-Potty.”

RELATED: How To Fuel For Your First Race

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FILED UNDER: Nutrition / Performance Nutrition TAGS: / / /

Julia Polloreno

Julia Polloreno

Julia Polloreno is the editor at large of Triathlete magazine. A Stanford University graduate with an award-winning track record in publishing, Polloreno is a two-time Ironman finisher and has been a competitive triathlete for more than a decade.

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