Regular cola can contribute carbohydrate to a marathon-training run if the amount on the pack fits a planned fuelling strategy and you tolerate the drink while running. It cannot, by itself, establish an adequate carbohydrate-and-fluid plan. Zero-sugar cola is a flavour choice rather than carbohydrate fuel; a caffeine-free version also suits runners who want to avoid caffeine, though it remains fizzy.
For longer sessions, plan carbohydrate and fluid deliberately rather than relying on a drink because it feels energising. Cola can be one practised component, but World Athletics notes that fluid needs vary between athletes.
If you enjoy cola around training but do not intend to use it as fuel, a zero-sugar version serves a different purpose from regular cola. A caffeine-free variant offers another choice when avoiding caffeine matters.
Carbonation is worth testing during ordinary training before you rely on cola during a run. The NHS identifies fizzy drinks as one possible cause of gas and bloating.
Decide whether the cola is meant to contribute carbohydrate or simply provide a preferred flavour, then check the serving, caffeine and how the drink feels during a run.
| Priority | What to check | Your needs |
|---|---|---|
| Carbohydrate | Read carbohydrate per serving on the exact pack. World Athletics lists 30–60 g per hour for endurance events lasting 1–2.5 hours and up to 90 g per hour for longer events; a cola serving is only one possible part of a plan. | If I intend to use cola as fuel, I need to know what the serving contributes alongside my other drinks and food. |
| Fluid plan | Consider what you will drink as well as what you will eat. World Athletics says athletes’ fluid needs vary; a can of cola does not define an individual fluid plan. | For a long run, I want a practised way to carry and consume both fluid and carbohydrate. |
| Carbonation | Try the intended serving and timing in training. The NHS notes that fizzy drinks can cause gas and bloating. | Fizzy drinks sometimes leave me uncomfortable, so I do not want my first trial to be during an important run. |
| Caffeine | Check whether the exact variant contains caffeine and account for other sources. World Athletics advises testing caffeine use in training before competition. | I may prefer a caffeine-free cola, or I may need to know how a caffeinated drink fits a plan I have already practised. |
| Variant and label | Match the product name, serving size, carbohydrate, sugars and ingredient statements to the physical pack. Pepsi UK lists 15 g carbohydrate per 330 ml of Pepsi Classic, while a Joybuy Pepsi Regular listing states 34 g per 330 ml. | Before counting a drink towards fuelling, I want the figures for the version I will actually consume. |
Variants differ: Pepsi UK lists 0 g carbohydrate per 330 ml of Pepsi Max, while Asda lists 35 g per 330 ml of Coca-Cola Original Taste.
Read carbohydrate per serving on the pack and count only that amount towards a planned intake. Do not use a zero-sugar cola as a substitute for carbohydrate fuel.
The NHS identifies fizzy drinks as a possible cause of gas and bloating. Tolerance at rest does not tell you how a drink will feel while running.
Test the product, serving and timing during an ordinary training run. If it causes discomfort, consider a non-carbonated way to carry out your fuel-and-fluid plan.
A caffeinated cola can add to caffeine consumed elsewhere, and an unfamiliar amount may not suit your training plan.
Check the exact variant and your other caffeine sources. World Athletics advises testing caffeine use in training before competition.
Pepsi UK lists 15 g carbohydrate per 330 ml of Pepsi Classic, whereas a Joybuy listing states 34 g per 330 ml for Pepsi Regular. Those figures should not be treated as interchangeable.
Before planning servings, check the name, serving size and nutrition panel on the pack you will use.
Coca-Cola Original Taste is a regular-sugar, caffeinated sparkling cola. Coca-Cola GB lists 10.6 g carbohydrate and 10.6 g sugars per 100 ml.
Pepsi UK lists regular Pepsi, Pepsi Max and Pepsi Max Caffeine-Free as distinct sugar and caffeine choices.
Asda’s Coca-Cola Original Taste listing provides nutrition information for a 330 ml can, rather than a measure for cola as a category.
These options cover a measured regular-cola serving and two zero-sugar choices, one of them caffeine-free. Choose according to whether you intend to count carbohydrate towards fuelling or simply want cola flavour around training.
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For a planned regular-cola serving, Joybuy lists 35 g carbohydrate per 330 ml can. Count it only within a separate carbohydrate-and-fluid plan. This fizzy cola contains caffeine; check the pack if its amount matters to your plan, and trial the drink during training.
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This caffeine-free, zero-sugar cola is a flavour choice, not a carbohydrate-fuelling option. Its stated values are 0.2 g carbohydrate and 0 g sugars per 330 ml. It contains sweeteners and a source of phenylalanine; check the pack, and test how you tolerate the carbonation.
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For cola flavour outside a carbohydrate-fuelling plan, this variant lists 0 g carbohydrate and 0 g sugars per 330 ml. It contains caffeine and sweeteners, including a source of phenylalanine. Check the pack if caffeine matters to your plan, and trial the fizzy drink in training.
Do not assume that regular cola alone covers both carbohydrate and fluid needs. It can contribute a labelled amount of carbohydrate to a practised plan. World Athletics lists 30–60 g carbohydrate per hour for endurance events lasting 1–2.5 hours and up to 90 g per hour for longer events; fluid needs vary between athletes.
Not as a meaningful source of carbohydrate. Pepsi UK lists 0 g carbohydrate per 330 ml of Pepsi Max and 0.2 g per 330 ml of Pepsi Max Caffeine-Free. Choose these for a cola preference, not to meet a carbohydrate target.
Use it only if caffeine fits a plan you have tested in training. World Athletics advises practising caffeine use before competition. Check the exact cola and account for caffeine from other drinks rather than estimating an amount from the variant name.
It could: the NHS identifies fizzy drinks as a possible cause of gas and bloating. Test the intended serving and timing during ordinary training. If carbonation causes discomfort, consider non-carbonated fuel and fluid for key runs.
Do not transfer a figure between apparently similar products. Pepsi UK lists 15 g carbohydrate per 330 ml of Pepsi Classic, while a Joybuy Pepsi Regular listing states 34 g per 330 ml. Read the nutrition panel on the pack you will consume before adding it to your fuel plan.