John Cox

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How to Fuel for Your First Marathon | Runner's World

Your early fatigue on long runs stems from consuming far too little fuel—you're likely taking in only 10-20 grams of carbohydrates per hour when experts recommend 30-60 grams (aiming for 45). Start fueling with the GUs that worked during your half-marathons, combining them with chews and spacing fuel every few miles rather than all at once, since your digestive system can only process a limited amount at a time. Begin gradually with a reduced fueling plan this weekend and build up over several runs, keeping detailed records in your training journal to identify what amount and type of fuel lets you feel energized without GI distress or sluggishness.

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