A Glycaemia-Prolonging Carbohydrate Gel Reduces Hunger and Cognitive Fatigue During Prolonged Esports Play

AbstractProlonged esports play can induce cognitive fatigue by placing sustained demands on executive control, decision-making, and stress regulation. Since the brain relies primarily on glucose as an immediate energy source, we hypothesized that a carbohydrate gel designed to prolong post-ingestion glycaemia stabilizes interstitial glucose, attenuates hunger and cognitive fatigue, and helps preserve performance during extended esports play. Eleven healthy young men completed a randomized, double-blind crossover study with two sessions in which they ingested one of two carbohydrate gels matched for total energy and total carbohydrate but differing in carbohydrate composition (high-fructose corn syrup [HFCS]-dominant vs maltodextrin [MDX]-dominant) before gameplay. Interstitial glucose was monitored continuously, while hunger, salivary cortisol, pupil diameter, executive function, and in-game performance were assessed repeatedly. Compared with the control (HFCS-dominant) condition, the glycaemia-prolonging formulation maintained higher interstitial glucose levels during the later phase of gameplay, blunted the progressive increase in hunger, and attenuated cortisol responses. These physiological and subjective advantages were accompanied by better executive control and more adaptive defensive behaviors in-game, including fewer fouls and more interceptions. In contrast, pupil diameter, an index of global arousal, remained unchanged across conditions, suggesting that benefits were not driven by altered arousal but by improved glycaemic stability and appetite regulation. These findings indicate that a carbohydrate formulation that prolongs glycaemia can reduce hunger-linked cognitive fatigue and support task-relevant behavior during prolonged esports play. This low-burden nutritional strategy may help sustain mental performance during prolonged digital activities that impose high cognitive demands. Highlights- A glycaemia-prolonging gel maintained higher interstitial glucose late in esports play - Hunger and salivary cortisol increased less with the glycaemia-prolonging formulation - Executive control and defensive performance improved (fewer fouls, more interceptions) - Pupil diameter was unchanged, suggesting benefits were not driven by altered arousal - A low-burden, glycaemia-stabilizing strategy may help sustain cognitive stamina