Runner's World tested eight energy gels for distance running performance, evaluating formulations across taste, texture, digestibility, and carbohydrate delivery. The publication assessed how each gel absorbs during sustained aerobic effort and affects gastrointestinal comfort during training runs and racing.
Energy gels serve as a primary fuel source for runners covering marathon distances and beyond. Most gels deliver 20-30 grams of carbohydrates per serving, typically from glucose, maltodextrin, or fructose blends. The timing and composition of gel intake directly influences blood glucose levels and aerobic power output during endurance events.
Runner's World's methodology focused on real-world application rather than controlled laboratory conditions. Testers consumed gels during actual training runs and races, measuring performance outcomes against baseline efforts. This approach captures what laboratory studies cannot. the athlete's genuine experience with taste palatability, stomach tolerance, and energy delivery during competition.
The publication separated marketing claims from actual performance data. Gels from established brands like GU, Gu Roctane, Maurten, and Science in Sport underwent identical testing protocols. Each gel's osmolality rating, caffeine content, and amino acid profiles received documentation.
Runners need specific recommendations tied to their individual gut tolerance and training duration. A gel that works for a half-marathon runner may create digestive issues for an ultramarathoner. Runner's World acknowledged this individual variability rather than declaring one universal winner.