A sugar-free chocolate biscuit can be an occasional snack if you want to limit sugar, but its label alone does not make it suitable fuel for a marathon. For events lasting more than 2.5 hours, World Athletics advises planning carbohydrate intake by the hour and identifies glucose plus fructose as an example of multiple transportable carbohydrate sources; check any biscuit’s ingredients and practise your chosen fuel before relying on it during a run.
If you want a lower-sugar biscuit while training, keep that snack choice separate from your plan for taking in carbohydrate during long runs. Check the sweetener and try the product away from an important session first.
Some sugar-free biscuits contain polyol sweeteners. The NHS says some polyols can have a laxative effect in large amounts, so an unfamiliar biscuit is a poor choice to introduce during a long run.
If you want a chocolate biscuit with little sugar rather than a timed running fuel, compare the exact pack’s sugars, carbohydrate, fat, ingredients and serving size.
Decide whether the biscuit is for an ordinary snack or for use during a run, then assess the label and the portion against that purpose.
| Priority | What to check | Your needs |
|---|---|---|
| Long-run fuel | For events over 2.5 hours, World Athletics describes carbohydrate plans reaching up to 90 g per hour and identifies multiple transportable carbohydrate sources, such as glucose plus fructose. Check the carbohydrate in the portion you intend to carry and practise your intake. | I need a carbohydrate plan I can follow during a long run, rather than choosing fuel because a biscuit has a sugar-free label. |
| Sweetener tolerance | Read the ingredients for polyols and check any on-pack excessive-consumption warning. The NHS says some polyols can have a laxative effect in large amounts. | Before taking biscuits on a run, I want to know whether I tolerate the exact product and portion. |
| Snack composition | Compare the precise sugar claim with sugars, total carbohydrate, fat and serving size on the nutrition panel. A low sugars figure does not describe all the other nutrients in a biscuit. | I’m choosing an occasional lower-sugar snack, but still want to know what a serving contains. |
| Ingredients and allergens | Check the current pack’s ingredient list, allergen declaration and any may-contain statement, particularly if you avoid wheat, milk, egg, soya or nuts. | If an ingredient matters to me, I need to check the pack I will actually eat rather than rely on a product name. |
The claim does not tell you whether a portion fits your planned carbohydrate intake during a long event. World Athletics expresses its guidance for events over 2.5 hours in carbohydrate grams per hour, not in biscuit labels.
Plan and practise your running fuel separately. If you intend to carry a biscuit, calculate its contribution from the current pack’s serving information.
The NHS says some polyols can have a laxative effect in large amounts, and the identified Diablo, OREO and Gullón listings carry excessive-consumption warnings.
Read the ingredients and warning, and try the exact product and portion away from an important run before considering it for use while running.
Holland & Barrett lists 0.2 g sugars, 39 g carbohydrate and 31 g fat per 100 g for Diablo Sugar Free Chocolate Chip Cookies. Tesco lists 0.4 g total sugars and 63 g available carbohydrate per 100 g for OREO No Added Sugar Vanilla Cookie Sandwich Biscuits.
Compare like-for-like figures per 100 g, then check what your intended serving contributes.
The identified biscuits have different ingredient and allergen declarations. A listing for one product, or for an earlier recipe, cannot stand in for the pack you receive.
Check that pack’s ingredients and allergen statement before eating it.
These examples illustrate product-level differences for lower-sugar snacking; brand names alone do not establish suitability as running fuel.
Gullón lists maltitol in its Dark Choc Digestive Zero Sugar Free biscuit. Tesco also lists a separate Gullón sugar-free Maria biscuit; its nutrition figures should not be applied to the dark-chocolate digestive.
Holland & Barrett lists Diablo Sugar Free Chocolate Chip Cookies as a maltitol-sweetened option for shoppers comparing occasional snacks.
Tesco lists OREO No Added Sugar Vanilla Cookie Sandwich Biscuits as a sweetener-containing sandwich biscuit. These details apply to that product, not to every OREO biscuit.
This Zero Sugar sandwich cookie is an option to assess as an occasional chocolate-biscuit snack. Its name does not establish that it fits a marathon fuelling plan.
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A 97g pack to consider for an occasional lower-sugar biscuit snack. Check the current pack’s sweeteners, allergens and nutrition per serving; if you plan to eat it near a run, try the intended portion beforehand.
Do not treat the sugar-free claim as a fuelling plan. For events over 2.5 hours, World Athletics describes carbohydrate intake of up to 90 g per hour using multiple transportable sources, such as glucose plus fructose. Plan and practise your intake, and check a biscuit’s actual portion and ingredients before relying on it during a run.
Some contain polyol sweeteners. The NHS says some polyols can have a laxative effect in large amounts, while listings for the identified Diablo, OREO and Gullón biscuits warn about excessive consumption. Check the exact pack and do not introduce an unfamiliar portion during a long run.
No. Tesco lists 63 g available carbohydrate and 0.4 g total sugars per 100 g for OREO No Added Sugar Vanilla Cookie Sandwich Biscuits. Read both figures on the specific pack and check the serving size when choosing a snack or calculating what you would carry on a run.
Check each current pack. The identified Diablo listing names wheat, egg and soya and flags possible milk, nuts, peanuts and sesame; the OREO listing names wheat and soya and flags possible milk. Gullón’s dark-chocolate digestive lists wheat and milk, with possible soya and nut exposure.