Why Do Gels Taste Sweeter the Longer You Run?
On long runs the gut comes under stress, and the sweetness that makes most gels appealing in the first 30-90 minutes becomes a liability by mile 15. Flavour fatigue sets in. Gels get skipped. Fuelling falls apart.
Dr. Jamie Pugh explains it simply: "Research shows that physical fatigue increases our perception of sweetness, which can lead to flavour fatigue which make athletes less likely to consume carbohydrates. In the later stages of prolonged exercise, athletes often report a disliking or a sensory aversion to sweet flavours. While the body needs the carbs, the flavour can become a barrier to consumption once intake exceeds tolerance."
The real-world pattern looks like this: fatigue builds, which increases the desire for something sweet. So the athlete reaches for a gel. But take on too much sweetness and the flavour becomes too intense - and it becomes difficult to maintain intake at the exact moment performance depends on it.
