Energy Gels & Alternatives for a Long Run

What to eat on a long run?

A colleague who is training for her first marathon asked me about what to eat on a long run, how to approach using energy gels and avoid getting that tired feeling after around 2 hours on the go.

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It made me realise that for all the information out there on the internet, it is often not clear how to get started using energy gels. I know this because on my first marathon attempt, a hilly trail marathon in Dorset, I did not finish, due to running out of fuel and generally being unable to take another step after completing about two-thirds of the course.

It turned out that bakewell slices were not the most effective means of fueling me around a trail marathon.

Personal choice

As any experienced distance runner will tell you, how, when and what you eat and drink during a long run comes down to personal preference, and you learn along the way what works best for you.

However, that’s not hugely helpful when you are after some initial guidance, so this post shares some simple tips for getting started using gels during runs.

Types of Energy Gel

There are loads of brands out there offering energy gels – and you will need to try a variety out and see which you get on with the best.

Shot Bloks Clif Bar Maurten Tailwind
A variety of gels and liquid nutrition

Ingredients will vary between brands and types of gels, but essentially what you are getting is a flavoured gel of relatively simple carbohydrates (basically, sugar!) to give you a boost when on the go. [Note – I’m not an expert in nutrition! If you read each product’s description in a shop or on their website, it should explain what is in their products in detail].

Use gels for runs of up to 4 hours.

I find that if I’m running for longer than this, I need some variety and gels start to get too sickly sweet after that long.

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It’s probably not that good for you to just eat gels for longer than this period of time, either. You can try for yourself though – I ran my first marathon, a 46k-long (28 mile) mountain trail marathon (Transgrancanaria), fueled virtually solely by gels (I think I consumed 12 over a period of about 8 hours). I had a sore mouth from all the sugar for several days afterwards, but it got me through…

Try starting with one gel every 30 minutes, after 1 hour on the go.

You may find you can stretch this out to every 40-45 minutes, or that choosing to have half a gel every 15-20 minutes works better for you.

Not all gels are created equally.

Some are sweeter than others, and some are thick, almost gooey, whereas others are closer to a liquid texture (and easier to digest).

Shot Bloks Clif Bar Maurten Tailwind
One of our favourite gels are Clif Shot Bloks, which are actually ‘chews’ rather than liquid (and hence less messy than gels!)

I find I can handle most textures of gel, from the very liquid (such as High5) to the more gooey (GU) and solid, chewy variety (Clif Shot Blok). I guess I’m lucky! Any of these work well for me on long runs, both on their own, and as part of a race vest smorgasbord incorporating energy bars, bananas, dried apricots and gels for marathon-plus distances and long days out on the trails.

spring energy gels review trail & kale-4-min

UPDATE: Our new favorite gels are Spring Energy!!

Shot Bloks Clif Bar Maurten Tailwind
Gel or Shot Blok sachets are easy to carry in a pocket, race vest or your hand.


Real food or liquid nutrition…

If you have tried gels and can’t get on with them (and have tried a variety of brands), see if you get on better with real food (bananas are awesome as they come in their own wrapper and are as natural as they come) or liquid nutrition instead. We highly rate Tailwind and Maurten as liquid nutrition options.

Shot Bloks Clif Bar Maurten Tailwind
A sachet of Tailwind or Maurten mixed in a 500ml bottle is something to try if you don’t get on with gels

Maurten Hydrogel Sports Fuel Drink Mix Review
Maurten Hydrogel Sports Fuel Drink Mix

Another option to try is also more solid energy food, such as Clif Bars. Personally, I find them a bit dry and hard to swallow when running, but great for after-run snacks and refueling.

Shot Bloks Clif Bar Maurten Tailwind
My favourite Clif Bar flavor, Coconut Chocolate Chip


This post should hopefully have helped demystify how to get started using energy gels for your long training runs and races.

To learn more about other types of running food and fuel, check out:

Let us know the energy gels you rate highly in the comments below! Also let me know if you have any questions and I’ll be happy to help!
Energy Gels & Alternatives for a Long Run 1 - Trail and Kale | Trail Running & Adventure

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