Best carbs for cycling & running to keep your stomach happy


Getting the right balance of nutrition pre, during and post exercise is a common challenge. We're all different too and so much can depend on a host of factors, from ingredients, to your hydration, to what you've eaten (or not eaten) beforehand.

A key issue that needs careful consideration is stomach upset - often caused by how carbohydrates are used during exercise, so we’ve talked to Will Girling, head nutritionist at ONE Pro Cycling & TREK Drops about how real, natural food can fuel your performance, helping you to feel and perform better, ensuring you can train and compete in confidence, without the tummy troubles.

The problem:
We know when your stomach is churning that you can’t enjoy your training and you won’t perform to your best either. 

We know that stomach upsets, painful cramps (and even embarrassing wind) can really mess things up and anyone who has had the unpleasant experience of an event 'Portaloo' knows that digestive problems in endurance sport are pretty common!

So, if you’ve suffered the indignity of a dash behind a tree, we understand your need. We also know it doesn’t have to be this way!

“Stomach issues while competing in endurance sports, such as running and cycling, are common and problematic. But there is light at the end of the tunnel! If we understand the principles of how much and how often we can take on carbohydrate, as well as the variables that can affect tummy troubles, we can easily solve these issues.”


Why Do We Need Carbs?

"Understanding the “why” for needing to take on carbohydrate during exercise is possibly the most important pillar of whether you feel you “should” or “should not” eat. By taking on carbohydrate, one is able to maintain blood glucose and energy levels to keep performing exercise for another hour over that of a non-carbohydrate placebo. The maintenance of blood glucose is what enables us to keep the intensity of exercise going, especially past the 2-hour point."

“So, if you’re going to be racing or out riding for longer than 2 hours then making sure you eat on the bike is incredibly important to ensure you get the most from your body.”


Veloforte | Best Carbohydrate to keep your stomach happy | Carbs for runners and cyclists

What Are The Best Carbs For Cycling And Running?

There are many great sources of carbohydrate for running and cycling. Natural sources of carbohydrate are easy on your stomach and taste great, as well as providing you with the vitamins and minerals you need for good health. You do not have to limit yourself to sports drinks or synthetic products.

Bananas are always a favourite amongst sports people, and are amongst the best carbs for cycling and running with good reason. They are easy to eat and have around 25 grams of carbs, depending on their size. The amount of carbohydrate in the form of sugar in a banana also varies depending on how ripe they are, the more yellow a banana the more of the starch has turned to sugar, making it easier to digest.

Energy bars that are full of natural energy from whole foods; dried fruits, berries and nuts are perfect, even chunks of sweet potato can be carried in your pockets.

When planning your carbohydrate intake, it is important to have meal plans, not just for during your ride but the night before and breakfast on race day to ensure you start with your carbohydrate stores full.

Veloforte | Best Carbohydrates to keep your stomach happy | Carbs for runners & cyclists 

How Much Should I Eat During Exercise?

“Knowing the amount of carbohydrate we can take on board during a race or per hour is incredibly valuable and could be the difference between a good race and a bad race. The amount we take on during activity is dictated by three main things;

  1. Maximal Absorption rates
  2. Intensity of exercise
  3. Duration of exercise

Item No. 1 - Maximal Absorption Rates
This comes first as it dictates the rest. There is a fixed amount of fuel we can absorb per hour and anything over this will start to wreak havoc for your stomach. Over fuelling can be as bad for your performance as under fuelling.

Glucose – 1g/per min or 60g/per hour

Fructose – 0.5g/per min or 30g/per hour

Glucose and Fructose are both forms of carbohydrate, but they use different individual transporters to pass through the intestine wall, meaning we can combine the two and have up to 90g/ per hour."

“Fructose is found in fruit and Glucose in honey, so Veloforte bars fit in very nicely here. A single bar (or 5 bites from a Bites Bag) per hour is an ideal way to contribute towards your quota - offering around 45g of Carbs per bar.” 


Next, item No.2 - Intensity of Excercise
“How hard you are riding affects two things; when we ride hard the stored carbohydrate in our bodies (in the form of muscle glycogen) is used at a faster rate, so we require a higher intake of carbohydrate to maintain blood glucose (60-90g/per hour). The other side to this is that the higher our exercise intensity the less blood flows to the stomach which can cause problems with our digestion. We can improve this though, just like you have a training program to get better at cycling or running, you should also train your stomach to be ready for eating on race day.”

And finally, No. 3 - Duration of Excercise
"Duration also plays a big role with the requirement for carbohydrate, the longer we perform for the more important carbohydrate becomes. Exercise that lasts less than an hour (like a crit race or 10km) needs less fuel, but if you're looking at an Ironman event ranging between the elite-level at 8/9 hours and the amateur-level at around 16 hours then eating become massively more important.”

How Often Should You Load Up On Carbs?

“I have researched the frequency of carbohydrate intake comparing one big feed against three smaller feeds, the results were equivocal – some participants performed better or the same with no detriment. However, we did see the trend of lower heart rates and rate of perceived exertion with three smaller feeds."

Smaller feedings of 20g every 20 minutes or 30g every 30 minutes is a convenient and manageable frequency to hit your target amounts.


Things you haven’t thought about…

“Of course carbohydrates are not the only reason you may have tummy troubles in racing or training. Here are a few more:

  • Hydration status
  • Fibre intake
  • Dairy intake
  • Fat intake
  • Heat

“Plan your nutrition and train with the food you will use during an event so your body is allowed time to get used to it. Follow the guidelines above on carbs for cycling and running and dedicate one session every one or two weeks specifically to fuelling as you will on race day to ensure you’re prepped and prepared.” 

Fuel Better – Feel Better

Top advice from Will, by following these good nutrition guidelines every time you're out you’ll find your stomach problems easing and your need for a panicked dash to the toilet reducing.

At Veloforte, we believe that real food performs best.
It's what drives us to create products that focus on three key tenants... Real-world performance, Incredible Taste & 100% Natural ingredients. Each of these are inextricably linked and together provide the optimal balance of effective, delicious and stomach-friendly nutrition that has the power to keep you going, all day!  

We know that natural foods contain a good balance of fructose and glucose, the fuels that are best for performance and best for your stomach, which is why we have based our recipes around tasty and delicious dried fruits and real foods.

Remember, it's so much more than just eating Carbs. By ensuring the optimal balance of 100% natural carbs, protein, fibre & fat means you'll go further, better and happier.

Veloforte | Best carbohydrates for running and cycling | Keeping your stomach happy

Tasting delicious has another important bonus. Digestion starts in your mouth, when you are about to take a bit of a food you love the taste of, your mouth begins to water, preparing your saliva with digestive enzymes and readying your stomach.

The more enjoyable the food the more likely you are to want to consume it and the better you digest it - seriously! If you can’t stand the flavour or texture of something, this early part of digestion doesn’t happen. We believe the trick to keeping your bowels under control is natural, powerful & delicious food you love, eaten little and often, throughout your running and cycling. #fuelbetter #nosynth 

Shop Now
(All our Bars & Bites are available in Packs of 3, and Boxes of up to 24)

Will Girling MSc – Head nutritionist ONE Pro Cycling – TREK DROPS
Instagram - @willgirling



A big fan of Veloforte. Having found cycling rather late in life I’ve started to push myself a bit with longer rides and events. The traditional sports nutrition energy sources weren’t really doing it for me. Veloforte appeared and hit the spot. Real food in easy to use format.

For me the biggest boost is that little treat every 20 minutes or so. When you’re feeling a bit low it picks you up and all of a sudden your pot feels half full rather than half empty. Cycling is a very mental sport so you need nutrition that puts you in a good mental place as well as providing the required fuel.

Marianne Rhys

I’ve always made my own, high-carb energy bars for cycling, but having tasted the range of Veloforte bars, I take a couple on every ride nowadays. They taste delicious – my favourite being the pistachio bar – and I can vouch for the definite energy boost they give, particularly on “challenging” rides. I’ve never been into seriously analysing carbs per hour figures etc. – I just make sure to eat a Veloforte bar when the other riders are indulging in cakes on the coffee stops! Thoroughly recommended.


Hi Sarah, thank you for your feedback, delighted you’re enjoying your Veloforte.

You’re quite right about the total carbs and that two bars per/hour would work very well if you’re training hard or competing. We have many customers adopting that very same approach, and recommend keeping all your intake 100% natural, and consistent.

Sorry for any confusion, we’ve amended the text to make it clearer. Thanks again!


Hi Joerg, our bars are 70g in total weight, offering 45g of carbs per bar… so the equivalent of two bars per hour would give you the maximum 90g/hr carb quota. Hope that helps.

Sarah King

I’m afraid I’m a little confused by this article as well. With a total carbs of 45 gms per bar, surely this would mean, if not using any other carb source, you’d need two bars an hour to reach the 90 gms recommended amount? I’ve been using them along side a carb sports drink so I’m hitting my 90 gms per hour and have found this works very well. Can’t wait for the new recipes!! 👍

Leave a comment