Andreas Almgren won the New York City Marathon with a unique fueling plan shaped by breath tests. He consumed 144 grams of carbohydrate per hour during long runs, but his body burned only 87 grams. This data guided his race strategy.

Almgren, a world half-marathon champion, used Maurten's sports nutrition products. His fueling plan involved consuming 120-130 grams of carbohydrate per hour. He experienced no stomach issues with this intake. Read more culture coverage.

Breath tests showed Almgren's body used most of its stored glycogen during long runs. He carb-loaded before the marathon to ensure enough energy. His fueling plan allowed him to finish strong, with carbohydrate supplying 93% of his energy in the closing kilometers. Related: Andreas Almgren Wins NYC Marathon on Debut with Record-Breaking Finish.

This original Runner World brief is based on reporting from Marathon Handbook. Visit the source for its complete reporting, context and any later corrections.