High-Carb Energy Gels

Standard gels contain 20 to 25 grams of carbohydrates per packet. High-carb gels pack 40 to 60 grams into a single serving, delivering roughly twice the fuel per packet. This reduces the number of gels needed per hour and simplifies fueling logistics during racing. Some brands achieve this higher concentration by using maltodextrin and fructose blends that maximize absorption through dual intestinal transport pathways.

Absorption depends on the carbohydrate sources used. Products combining glucose-based carbohydrates with fructose can push absorption rates to 90 to 120 grams per hour because each sugar type uses a separate intestinal transporter. A single 40-gram gel using this dual-source approach can be absorbed within 20 to 30 minutes in a trained gut. However, athletes who have not practiced high-carb intake during training will likely experience gastrointestinal distress at these levels.

They can reduce reliance on carb drinks but do not eliminate the need for fluid. A high-carb gel with water covers the carbohydrate requirement, but a carb drink provides both fuel and hydration simultaneously. The choice depends on your preference and race logistics. Some athletes prefer water-only bottles paired with high-carb gels for simplicity, while others use a moderate carb drink alongside standard gels to spread intake across formats.

During exercise, muscles clear glucose from the blood rapidly, so the spike-and-crash pattern common at rest is less pronounced. Glycemic index has more practical relevance in pre-exercise feeding, where lower-GI foods can provide a steadier energy release before the start. Once you are moving and carbohydrate demand is high, the body processes fuel from gels efficiently regardless of glycemic index. If you are sensitive to blood sugar fluctuations, consuming your gel during exercise rather than in the minutes before starting reduces the risk of a reactive insulin response.

Begin at 30 to 40 grams of carbohydrates per hour during training and add 10 grams per week until you reach your race target. Practice at race-relevant intensity, not just easy-day pace, because higher effort levels reduce gut blood flow and change tolerance. Published data in Medicine and Science in Sports and Exercise shows that athletes who practice high-carb intake in training report significantly fewer gastrointestinal symptoms during competition compared to those who only fuel lightly in training.

No. The physiological capacity to absorb carbohydrates through dual-transport pathways exists in all healthy adults. The difference between elite and recreational athletes is primarily that elites have more exposure to gut training through higher training volumes. Recreational athletes competing in marathons, century rides, or triathlons lasting over two and a half hours face the same glycogen depletion risks and benefit equally from higher carbohydrate intake rates when properly trained.

Divide your hourly carbohydrate target into smaller doses consumed every 15 to 20 minutes rather than taking one large bolus per hour. If your target is 80 grams per hour from a gel containing 40 grams, take half a gel every 15 minutes or one full gel every 30 minutes. Smaller, more frequent doses maintain steadier blood glucose and reduce the osmotic load on the stomach at any single point. Set a timer on your watch as a reminder until the habit becomes automatic. (edited)