Earlier quoted context omitted.
> The Maurten research team was embedded with Sawe’s team in Kenya for 32 days across six trips between last and this April. They were training his gut to absorb that load by mimicking race-day protocol in training. The hydrogel technology they have developed over the past 10 years now allows athletes to absorb 90–120 grams of carbs per hour without GI distress. That common knowledge, nothing revolutionary here. Ther…
I'm not the expert on the bio but the gel has the advantage of being consumable while running. Try drinking while running. Even at a slower pace it's hard not to spill. If you want the dosage correct you can't spill.
But maybe I'm mistaken and they dont do that for marathon.