The 60g Per Hour Rule: What It Means, Why It Matters, and How to Actually Hit It

The single biggest performance lever most endurance athletes are leaving on the table.

Most athletes think training is everything.

More kilometres. More intervals. More suffering. And yes, all of that matters. But here is something most coaches will tell you that most athletes still don't act on: on race day, your nutrition can make or break your performance more than almost anything else you do.

Not your VO2 max. Not your long run mileage. Not your taper.

Your fuel.

Specifically, how many carbohydrates you're getting into your body per hour. And whether your gut can actually absorb them.

Why Carbohydrates Are Your Engine

Your muscles run on glycogen. Glycogen is just carbohydrate stored in your muscle tissue and liver. During a hard endurance effort, your body burns through it at a significant rate.

The problem: your storage is limited. A well-fuelled athlete might carry enough glycogen to last around 90 minutes at race pace. After that, if you haven't been topping up from the outside, you start running low. Energy drops. Pace drops. Everything gets harder than it should be.

This is the famous wall. Hitting it is not inevitable. It's a fuelling failure.

Research consistently shows that carbohydrate ingestion during exercise improves time-to-exhaustion and time-trial performance in endurance events lasting more than two hours. Recovery For Athletes The science on this is not disputed. Carbohydrates during a long effort make you faster. The question is how much, and what kind.

The 60g Per Hour Rule — Where It Came From

For years, sports scientists recommended consuming around 60 grams of carbohydrate per hour during endurance exercise. That guidance came from a very specific place.

The original 60g per hour recommendation was based on the maximum capacity of SGLT1 transporters to absorb glucose in the intestine. Recovery For Athletes These are the proteins in your gut wall that physically carry glucose molecules from your digestive system into your bloodstream. They have a ceiling. Once they're working at full capacity, extra glucose just queues up in your intestine and causes problems rather than fuelling performance.

So 60g per hour was the rule. And for a long time, that was considered the limit.

Then researchers asked a simple but game-changing question: what if you used a different door?

The Dual Transporter Discovery That Changed Everything

Fructose, it turns out, uses a completely separate intestinal transporter called GLUT5. It doesn't compete with glucose at all. They absorb through entirely different channels, simultaneously.

When cyclists drank a 50/50 glucose and fructose mix, the amount of ingested carbohydrate they were actually able to use for energy production increased by over a fifth compared to glucose alone. Nutritiontriathlon

That was the breakthrough. Two transporters, two lanes, more total fuel reaching your muscles per hour without overloading either pathway.

Research showed that a 2:1 ratio of glucose to fructose, delivering up to 90 grams of carbohydrate per hour, increased carbohydrate oxidation rates by 50% compared to glucose alone. Recovery For Athletes

Fifty percent more fuel getting to your muscles. That is not a marginal gain. That is a significant performance number that has completely reshaped how elite athletes fuel long efforts.

The greatest performance enhancement in large-scale research was seen at a carbohydrate ingestion rate of between 60 and 80 grams per hour, with new guidelines recommending up to 90 grams per hour for ultra-endurance events. Endurance

What Most Athletes Actually Do

Here is where it gets interesting.

Studies measuring actual carbohydrate intake during long races found that most athletes average only 45 to 54 grams per hour. Most try to take in more, but GI symptoms prevent them from reaching higher amounts. Running Warehouse

The gap between what athletes are consuming and what the science says they should be consuming is enormous. And the gut distress that holds them back is, in most cases, a product problem not a physiology problem. Synthetic gels loaded with processed ingredients put extra strain on a digestive system that is already under stress from reduced blood flow and mechanical impact.

How 2THRV Is Built Around This

This is not an accident of formulation. Every ingredient in 2THRV was chosen with this science in mind.

Organic maple syrup provides glucose and sucrose for immediate energy delivery through the SGLT1 glucose transporter. Fast, clean, recognised by your body instantly.

Organic dates provide natural fructose that hits the GLUT5 transporter simultaneously. The second lane opens up. Total carbohydrate absorption increases without overloading either pathway.

The result is a whole food gel that naturally achieves the glucose to fructose ratio the research points to as optimal, without maltodextrin, without synthetic fructose, and without anything your gut has to fight to process.

One 2THRV pouch delivers around 30 grams of carbohydrate. Two per hour puts you in the 60g per hour sweet spot backed by the research. For longer ultra-distance efforts, you have room to scale up while your gut stays comfortable because the ingredients are working with your digestive system, not against it.

The Practical Takeaway

If you are running a marathon, doing an Ironman, riding a century, or racing anything over 90 minutes, your fuelling window opens from the first 30 minutes and stays open the entire time.

Start early. Stay consistent. Hit 60 to 90 grams per hour depending on your effort duration and intensity. Pair it with adequate fluid. And choose a fuel your gut actually recognises.

The evidence supports 60 to 90 grams of carbohydrate per hour for most athletes pushing their limits in races longer than two hours. Athletes who hit these numbers consistently report better pacing, lower perceived exertion, and improved recovery. The Feed

The wall is not inevitable. It is a fuelling problem. And fuelling problems have solutions.

[Try 2THRV — whole food endurance fuel built around the science of carbohydrate absorption.]

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