Exercise Fueling

Endurance athletes benefit from relying on fat at lower intensities while preserving limited carbohydrate stores for higher-demand efforts. Carbohydrate use is treated as necessary fuel for some performance demands rather than inherently bad. The Adidas running team example reports improved body composition and running time after a five-week Lumen-guided carbohydrate optimization intervention, but methodological details are missing. A person preparing for intense or strength-focused training may consume carbohydrates if breath measurement shows heavy fat use. Breath measurement is presented as a tool for balancing sufficient carbohydrate intake for work with avoiding overconsumption.