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Old Fri, Jun-09-17, 14:20
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bluesinger bluesinger is offline
Doing My Best
Posts: 4,917
Plan: LC/CancerRecovery
Stats: 170/135/130 Female 62 inches
Progress: 88%
Location: Nevada Desert, USA

I don't think many of us are marathon runners here, but I did a search and came up with at least one link which may apply:

Found the following:
Matt Fitzgerald explains in his book The New Rules of Marathon and Half Marathon Nutrition, “As long as some of your harder workouts are carb-fueled and others are not, your fat-burning capacity will increase more than if you fueled every hard workout with carbs and your fitness will increase more than if you never took advantage of the performance-enhancing power of carbohydrate.”
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