Ketosis in running
[kee-toh-sis in ruh-ning]
/kɪˈtoʊsɪs ɪn ˈrʌnɪŋ/
Noun
A metabolic state in which the body primarily uses ketone bodies derived from fat as a source of energy during prolonged running or endurance exercise.
Ketosis is a metabolic state where the body burns fat for fuel instead of carbohydrates, producing ketones. This can enhance endurance by providing a steady energy source during long runs. Runners may enter ketosis through a low-carb, high-fat diet. Real-world examples include ultra-endurance athletes who use ketosis to sustain energy over long distances. It matters to runners as it can improve fat oxidation, reduce reliance on glycogen, and potentially enhance performance in long-duration events. However, adaptation takes time, and not all runners may benefit equally from this metabolic shift.