Maybe — and that's a more honest answer than the field used to give. The standard advice of 30 to 60 grams of carbs an hour is the same for a 130-pound runner and a 200-pound one, because gut absorption was long thought to be roughly weight-independent. Recent research suggests bigger athletes burn more carbs and may absorb more too. The practical takeaway: if you're a bigger runner, start at the upper half of that range and train your gut upward from there.
Why is the standard advice the same for everyone?
For years, the fueling guideline — 30 to 60 grams of carbs an hour, up toward 90-plus for trained athletes going long — came without a body-size adjustment. The reasoning was that the bottleneck sits in your gut, not your muscles: the rate at which carbs cross from your intestine into your blood was thought to cap out at about the same ceiling for everyone, regardless of how big the engine burning them was. A single carb source saturates its absorption route around 60 grams an hour; a glucose-and-fructose mix, using two routes, lets trained guts push higher. None of that math referenced your weight. So the same number went in every plan, and for most runners it works fine — the full picture is in how many carbs per hour you need.
What does the newer research suggest?
That body size might matter more than the old blanket number allowed. A 2024 study in the International Journal of Sport Nutrition and Exercise Metabolism found larger athletes oxidized ingested glucose at meaningfully higher rates than smaller athletes during moderate cycling — roughly 45 grams an hour in the larger group versus 33 in the smaller one. In plain terms: a bigger engine appears to both burn more fuel and take up more of the fuel you feed it. The researchers themselves framed body size as something that may be worth factoring into future guidelines — a signal, not a rewrite. Alongside it, contemporary work has nudged the trained-athlete ceiling upward, from around 90 grams an hour toward 120 in the most extreme cases. The direction is clear; the precise numbers are still being worked out.
Should you use a body-weight formula?
Not yet — and this is where "recent research suggests" has to stay honest. You'll see per-body-weight framings floating around — roughly a third of a gram of carbs per pound per hour (the research states it as about 0.7 grams per kilogram) — offered as a way to scale intake to size. Treat these as proposals, not protocol. The science pointing toward size-based fueling is young: a handful of studies, mostly on cyclists, averaging across small groups. That's enough to say "bigger athletes probably need and can handle more," and nowhere near enough to hand you a precise formula to fuel your marathon by. Adopting a body-weight number as gospel just trades a slightly-too-low blanket guideline for a false-precision one. Here's what's known versus not:
| What the research points to | What it can't tell you yet |
|---|---|
| Bigger athletes burn more carbs per hour | Exactly how much more, for you specifically |
| They appear to absorb more, too | Whether a fixed body-weight formula holds across runners |
| Size is worth factoring into fueling | What the revised guideline numbers should be |
So what should a bigger runner actually do?
Start at the upper half of the range and build from there — practically, not by formula. If the guideline is 30 to 60 grams an hour, a bigger runner treating 45 to 60 as the starting band rather than 30 to 40 is a reasonable read of where the evidence points. Then do what every athlete should do regardless of size: train your gut up from that starting point. Your gut adapts to carbs like your legs adapt to mileage — add a little more every week or two, practice at race pace, and take every gel with water. The step-by-step is in how to train your gut to absorb more carbs, and the beginner-to-advanced framing that this all sits inside is in the carb sweet spot: beginner vs. advanced fueling. Gut-training upward is the move whether or not the body-weight science firms up — it's how you find your number instead of guessing at a group average.
Does hydration scale with size too?
It does, and this part is less controversial than the carb question. Bigger bodies tend to generate more heat and sweat more, which means more fluid and more sodium to replace — though sweat rate varies enormously from person to person, so size is a tendency, not a rule. If you're a bigger runner, it's worth assuming your fluid and electrolyte needs run on the higher side, especially in the heat, and planning accordingly rather than matching a smaller training partner sip for sip. The hot-day breakdown is in how to fuel in hot weather.
Fueling to your size with Hüma
Whatever number you land on, the tools are the same. Each Hüma Original pouch carries 24 grams of real-food carbs from brown rice syrup and real fruit purees with chia — and because the fruit brings both glucose and fructose, both absorption routes are working as you build your rate up. Two to three per hour lands most runners in the range; a bigger runner aiming higher can lean toward three, or reach for Ultra — 40 grams of carbs in one pouch — to hit a higher rate without unwrapping more often. There's more water in the formula than a thick, syrupy gel, which helps as you ramp up, and PLUS doubles the electrolytes for the bigger sweat loads that tend to come with a bigger frame. Add a little at a time, rehearse it in training, and let your own gut tell you where your number is.
Related guides
- The carb sweet spot: beginner vs. advanced fueling
- How to train your gut to absorb more carbs
- How many carbs per hour for a marathon
- How to fuel in hot weather
- Endurance Nutrition 101: the basics of fueling
FAQ
Do bigger runners need more carbs per hour?
Recent research suggests they may. Larger athletes appear to burn more carbs and absorb more of what they take in, so bigger runners can reasonably start at the upper half of the 30-to-60-gram range rather than the low end — then train their gut upward from there.
Is there a carbs-per-body-weight formula?
Framings like about a third of a gram of carbs per pound per hour have been proposed, but treat them as early proposals, not settled protocol. The science pointing toward size-based fueling is young — enough to adjust your starting point, not enough to fuel by a fixed formula.
Why is the standard advice the same regardless of weight?
Because gut absorption — not muscle demand — was long thought to be the bottleneck, and that ceiling was considered roughly weight-independent. Newer evidence is challenging that, but the classic 30-to-60-gram guideline still works well for most runners.
How should a bigger runner build up their carb intake?
Start at the upper half of the range, then add roughly 10 to 15 grams every week or two on your long runs, practice at race pace, and take every gel with water. Gut training is how you find your own number instead of guessing at a group average.
Do bigger athletes need more electrolytes?
Often, yes — bigger bodies tend to sweat more and lose more fluid and sodium, especially in heat. But sweat rate varies hugely between people, so treat size as a tendency and plan on the higher side rather than matching a smaller partner exactly.
