Here's a great interview of the the legendary Dr Tim Noakes, the highly regarded author of books such as "The Lore of Running." He talks about diet...particularly the use of carbohydrates...fueling, hydration and more. Those of you running marathons and farther will not want to miss this.
You can listen to it here: http://www.enduranceplanet.com/dr-tim-noakes-the-real-deal-on-carbs-for-the-endurance-athlete-hydration-and-learning-to-drink-to-thirst-the-central-governor-theory-and-much-more/
By the way...the Endurance Planet website is always having loads of cool podcasts. You might want to check it occasionally to see what's new...or old. I have no connection or anything to it. I'm just a fan.