Choose cold brew for the coffee you want before a 5k, but do not assume it will also provide the carbohydrate you want from food. An unsweetened concentrate gives you control over dilution; a ready-to-drink dairy or oat latte is simpler to carry, provided its ingredients suit you. Check carbohydrate per serving and caffeine in milligrams where stated, and stick with a pre-run routine you already tolerate.
The useful distinction is whether you are buying coffee for its flavour and convenience, or expecting the drink to take the place of food before a run.
If you want a chilled coffee before a 5k, read the carbohydrate figure for the amount you will actually drink. Tesco Groceries lists 2.4g carbohydrate per prepared 200ml glass of its Finest unsweetened concentrate; choose food separately if your pre-run plan calls for it.
A dairy latte and an oat latte have different ingredient considerations. M&S lists semi-skimmed milk in its Classic Latte, while its 250ml Oat Latte is labelled unsuitable for coeliacs and people with wheat allergy. If a drink has previously caused stomach discomfort, avoid making it a new experiment on an important run.
Look for caffeine stated in milligrams per serving or per 100ml, particularly on a multi-serve bottle. M&S states 34.6mg per 100ml for its 750ml Plant Kitchen chilled oat latte, so the amount poured matters more than a description such as “cold brew” or “double shot”.
Start with the drink’s job in your pre-run routine, then compare the label for the portion you intend to have. Format, ingredients and storage determine whether that choice is practical.
| Priority | What to check | Your needs |
|---|---|---|
| Caffeine amount | Find milligrams per serving or per 100ml, then consider how much you will pour. M&S states 34.6mg per 100ml for its 750ml chilled oat latte; a coffee-style name alone does not give you a dose. | I want to know how much caffeine is in my portion, especially if the pack holds more than one drink. |
| Carbohydrate | Compare grams for the prepared serving, not just the product name. Tesco Groceries lists 2.4g per prepared 200ml glass of its unsweetened concentrate; M&S lists 5.0g per 100g for its Classic Latte and 7.5g per 100g for its Oat Latte. | If I need food before my run, I do not want to mistake a coffee or a sweet-tasting latte for my whole plan. |
| Ingredients and allergens | Read the current pack for milk, oats and allergen warnings. The M&S Classic Latte contains semi-skimmed milk; its 250ml Oat Latte is dairy-free but labelled unsuitable for coeliacs and people with wheat allergy. | Milk does not suit my usual pre-run routine, or I need to check whether this exact oat drink meets my dietary requirements. |
| Preparation and storage | Check whether it needs diluting, is ready to drink, or must be kept chilled. Tesco Groceries directs users to add 100ml cold water to 100ml of its concentrate; a ready-to-drink can avoids that preparation step. | Some days I can mix a drink at home; on others, I need a portion I can take with me without measuring it out. |
“Cold brew”, “Arabica” and “double shot” do not tell you the milligrams in your portion. For comparison, M&S explicitly labels its 750ml chilled oat latte at 34.6mg per 100ml.
If measuring caffeine matters to you, choose a pack that states an amount and check the serving size. Keep an important run to a caffeine routine you already know.
Tesco Groceries lists just 2.4g carbohydrate per prepared 200ml glass of its Finest unsweetened concentrate. That figure describes the coffee, not everything you might need or choose to eat before running.
Decide on any pre-run food separately, using your usual timing and tolerance rather than relying on the drink’s name.
M&S labels its 250ml Oat Latte dairy-free, but also says it is unsuitable for coeliacs and people with wheat allergy. Dairy avoidance and those dietary requirements are different checks.
Read the ingredients and allergen statement on the exact size and flavour you are buying.
At the stated 34.6mg caffeine per 100ml, the full 750ml M&S Plant Kitchen chilled oat latte would contain 259.5mg. The product is labelled high caffeine and not recommended for children or pregnant or breast-feeding women.
Measure the amount you intend to drink, account for caffeine from other drinks, and follow the pack’s storage instructions.
These examples illustrate different cold-coffee formats; check the exact product rather than applying one line’s ingredients or label figures to every drink from the same brand.
Tesco Groceries lists an unsweetened cold-brew concentrate prepared by mixing 100ml concentrate with 100ml cold water.
Marks & Spencer lists a 250ml milk-based cold-brew latte, a 250ml dairy-free oat latte and a larger chilled oat latte.
Coffee Friend UK lists a 200ml Sandows black cold brew made with coffee and filtered water.
Sainsbury's Groceries lists iced-coffee formats that include lactose-free drinks, multi-serve products and unsweetened concentrate.
These are portioned cold-coffee concentrates and powders to mix with water, rather than ready-to-drink dairy or oat lattes. Compare the pack format and preparation you want, and check caffeine and ingredients on the exact product before making it part of a pre-run routine.
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The individual pouches suit a routine in which you can add water before drinking. This is a concentrate, not a ready-to-drink pouch: check the dilution directions, the caffeine amount if you track it, and the pack’s energy figure before relying on it.
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This flavoured powder is an option if you want to make a cold coffee with water rather than buy a ready-to-drink latte. Check the preparation directions, ingredients and caffeine amount on the pack; the sweet potato flavour makes it a different choice from plain black coffee.
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The small portions are intended for mixing a cold coffee without brewing equipment. Confirm the exact flavour and formulation for this SKU before ordering, and check the pack for caffeine in milligrams if you want to plan your portion.
Do not count on cold brew alone to provide the carbohydrate you want from food. Tesco Groceries lists 2.4g carbohydrate per prepared 200ml glass of its Finest unsweetened concentrate. Decide what, if anything, to eat using a pre-run routine and timing you already tolerate.
Only if the product states caffeine in milligrams and you know your portion. M&S labels its 750ml Plant Kitchen chilled oat latte at 34.6mg per 100ml; words such as “cold brew” or “double shot” cannot substitute for that figure. The 2021 International Society of Sports Nutrition position stand discusses caffeine and exercise performance, but it does not establish the caffeine content or suitability of an individual drink.
A familiar alternative is a more predictable choice than testing a new milk drink on that run. M&S lists semi-skimmed milk in its Classic Latte, and the NHS lists stomach discomfort, bloating and diarrhoea among possible symptoms of lactose intolerance. Seek medical advice if symptoms persist.
Do not assume so from “dairy-free” wording. Marks & Spencer labels its 250ml Oat Latte Cold Brew Coffee unsuitable for coeliacs and people with wheat allergy. Check the allergen statement on the exact product you intend to drink.
Check the labelled caffeine per 100ml against the amount you would drink. The NHS advises no more than 200mg caffeine a day in pregnancy. M&S labels its 750ml Plant Kitchen chilled oat latte at 34.6mg per 100ml—259.5mg in the full bottle—and states that it is not recommended for pregnant or breast-feeding women.