Choose diet or zero-sugar cola for the taste, not for carbohydrate before a 5k: the Coca-Cola Zero Sugar, Pepsi Max and Diet Pepsi products described by their UK manufacturers list 0g carbohydrate. Regular cola contains carbohydrate, but the UK Sports Institute suggests a carbohydrate-based breakfast or a banana when time is short rather than relying on cola as a pre-run routine. If you want cola without caffeine, check the exact variant; removing caffeine does not turn a zero-sugar drink into fuel.
If you are considering diet cola in place of a missed snack, check the carbohydrate figure first. Coca-Cola Great Britain and PepsiCo UK list 0g carbohydrate for Coca-Cola Zero Sugar, Pepsi Max and Diet Pepsi. The UK Sports Institute instead suggests food such as a banana when there is little time before a run.
If you have already planned what to eat before running and want a cola without sugar, a diet or zero-sugar variant addresses that drink preference. Keep it separate from the question of whether you need carbohydrate before the 5k.
Pepsi Max No Caffeine offers a caffeine-free cola variant, but its label also lists aspartame and a source of phenylalanine. If you have phenylketonuria (PKU), check the exact product label and follow your specialist dietary guidance; the Food Standards Agency identifies aspartame as a possible risk for people with PKU.
Decide whether you want carbohydrate before running or simply a cola to drink, then check the serving, ingredients and timing that matter to you.
| Priority | What to check | Your needs |
|---|---|---|
| Carbohydrate | Read the carbohydrate amount for the stated serving. Coca-Cola Great Britain lists 10.6g per 100ml for Original Taste and 0g for Zero Sugar; PepsiCo UK lists 15g per 330ml for regular Pepsi and 0g for Pepsi Max and Diet Pepsi. | If I have missed food before my run, I want a carbohydrate option rather than assuming diet cola supplies it. The UK Sports Institute suggests a banana when time is short. |
| Sugar preference | Check both sugars and carbohydrate: a zero-sugar label does not mean the drink supplies pre-run carbohydrate. Compare figures on the same per-100ml or per-serving basis. | I may want cola flavour without sugar after arranging my pre-run food separately. |
| Caffeine | Check the exact variant and ingredients. PepsiCo UK identifies Pepsi Max No Caffeine as caffeine-free; its Pepsi Max and Diet Pepsi ingredient lists include caffeine. | If I prefer to avoid caffeine before running, I want the pack to say so explicitly rather than relying on the words ‘diet’ or ‘zero sugar’. |
| Aspartame | Read the current ingredient list and phenylalanine statement. Coca-Cola Zero Sugar, Pepsi Max, Diet Pepsi and Pepsi Max No Caffeine list aspartame in their cited UK product information. | If I have PKU, the exact ingredients matter more than whether a cola is regular, diet or caffeine-free. The Food Standards Agency identifies aspartame as a possible risk for people with PKU. |
| Pre-run routine | Consider when you will eat and what you can tolerate before running. The UK Sports Institute says runners commonly eat one to three hours beforehand and that a sports drink is probably unnecessary after a carbohydrate-based breakfast. | I would rather plan food and water around my run than count on an unfamiliar cola to do the job. |
Coca-Cola Zero Sugar, Pepsi Max and Diet Pepsi list 0g carbohydrate in the cited UK product information. Choosing one does not provide the carbohydrate you intended to get from a pre-run snack.
If carbohydrate is the reason you are eating or drinking before a 5k, plan that separately. The UK Sports Institute suggests a carbohydrate-based breakfast or a banana when time is short.
Pepsi Max and Diet Pepsi list caffeine in their ingredients, while Pepsi Max No Caffeine is a distinct variant.
If avoiding caffeine matters to you, check the full product name and current ingredient list.
The cited Coca-Cola Zero Sugar, Pepsi Max, Diet Pepsi and Pepsi Max No Caffeine products list aspartame and state that they contain a source of phenylalanine. The Food Standards Agency identifies aspartame as a possible risk for people with PKU.
If you have PKU, check the exact variant’s current label and follow your specialist dietary guidance.
The UK Sports Institute’s pre-run advice distinguishes between someone who has eaten a carbohydrate-based breakfast and someone who has missed food. The same drink choice does not address both situations.
Decide what you will eat and drink ahead of time, and try an unfamiliar routine on an ordinary run rather than introducing it for the event.
Coca-Cola Great Britain’s Original Taste and Zero Sugar labels show the difference between its carbohydrate-containing and zero-sugar variants.
PepsiCo UK lists regular, diet, zero-sugar and explicitly caffeine-free cola variants, so the full product name matters.
Tesco Groceries lists own-label and branded diet or sugar-free colas, including Tesco Xero Cola, as options to compare by their exact pack labels.
These multipacks cover regular cola with carbohydrate, zero-sugar cola and an explicitly caffeine-free zero-sugar variant. Choose between them by the drink you want; a cola listing does not establish a pre-run food-and-fluid routine.
No image available
A regular cola to consider if you specifically want carbohydrate in the drink, rather than a zero-sugar variant. Coca-Cola Great Britain lists 10.6g carbohydrate and 10.6g sugars per 100ml for Original Taste; it also lists caffeine flavouring. Carbohydrate content alone does not establish that cola will suit your pre-run routine.
No image available
This variant is for someone who wants zero-sugar cola without caffeine, not carbohydrate before a run. PepsiCo UK lists 0.2g carbohydrate and 0g sugars per 330ml for Pepsi Max No Caffeine. It lists aspartame and a source of phenylalanine, so check the current label if you have PKU.
No image available
Choose this for a zero-sugar cola preference after planning pre-run food separately. PepsiCo UK lists 0g carbohydrate and 0g sugars for Pepsi Max, so it is not a source of carbohydrate fuel. Its cited ingredients include caffeine and aspartame, with a source-of-phenylalanine statement.
No image available
This is a zero-sugar cola choice, not a substitute for pre-run carbohydrate. Coca-Cola Great Britain lists 0g carbohydrate and 0g sugars for Zero Sugar. Its cited ingredients include aspartame, and the label states that it contains a source of phenylalanine; check the current pack if you have PKU.
No: Coca-Cola Great Britain and PepsiCo UK list 0g carbohydrate for Coca-Cola Zero Sugar, Pepsi Max and Diet Pepsi. They may fit a no-sugar cola preference, but they do not replace food when carbohydrate is what you want before running.
Regular cola contains carbohydrate where the cited zero-sugar variants do not: PepsiCo UK lists 15g per 330ml for regular Pepsi, and Coca-Cola Great Britain lists 10.6g per 100ml for Original Taste. That difference does not make cola the right pre-run routine for everyone. The UK Sports Institute suggests a carbohydrate-based breakfast or a banana when time is short.
Pepsi Max No Caffeine is an explicitly caffeine-free, zero-sugar variant according to PepsiCo UK. Its panel lists 0.2g carbohydrate and 0g sugars per 330ml, so choose it for the drink preference rather than for carbohydrate fuel.
Check the exact variant’s current ingredients for aspartame and its phenylalanine statement, and follow specialist dietary guidance. The cited Coca-Cola Zero Sugar, Pepsi Max, Diet Pepsi and Pepsi Max No Caffeine labels list aspartame; the Food Standards Agency identifies it as a possible risk for people with phenylketonuria (PKU).
Not necessarily. The UK Sports Institute says a sports drink is probably unnecessary if you have had a carbohydrate-based breakfast before a parkrun-style run, and suggests a banana when time is short. Plan what you eat and drink around your own timing rather than treating cola as a required part of the run.