Ramos-Campo et al. 2023, carbohydrate feeding & endurance performance meta-analysis

Meta-analysis and meta-regression of 136 studies published in Critical Reviews in Food Science and Nutrition, quantifying the ergogenic effect of acute carbohydrate feeding during endurance exercise. Confirms that carbohydrate is effective across durations, with the benefit increasing with event length and being larger in less-trained athletes; dosage form was not a significant moderator. Strong evidence.