Long-run fuel planners
You want portions you can count and carry, and a chance to find out during training whether cakes are comfortable to eat while moving.
Who is choosing a pack?
Training-group snack buyers
You need enough cakes to share across a session or several trials. Check the pack count and current availability before planning around a particular format.
Runners checking ingredients
You need the exact pack’s ingredients and allergen information before eating or sharing it. Branded, own-label and mini versions can have different statements.
What should you check?
Start with the portion information on the pack you intend to buy, then decide whether its format works for the run or group session.
| Priority | What to check | Your needs |
|---|---|---|
| Carbohydrate portions | Check the exact pack’s carbohydrate figure and whether it is per cake, per serving or per 100 g. ASDA Groceries lists 7.6 g per cake for its McVitie’s 30-cake pack and 8.5 g for its 36-cake pack; Sainsbury’s lists 8.2 g for its 24-cake pack. | I want to count portions using the cakes I actually buy, rather than assume every Jaffa Cake has the same figure. |
| Eating during a run | Consider the session’s duration and intensity, and try carrying and eating the chosen format in training. Science in Sport’s marathon-training guidance says carbohydrate needs vary with the session. | If I plan to eat while running, I need a format I can carry and consume comfortably at my training pace. |
| Pack quantity | Match the cake count to the people and sessions involved. Recheck availability: the checked ASDA Groceries 36-cake listing was unavailable, and Sainsbury’s marked its 24-cake pack out of stock. | For a group, I need enough countable cakes without organising the session around a pack I cannot obtain. |
| Ingredients and storage | Read the purchased pack’s ingredients, allergen statement and opened-pack instructions. Mini-cake nutrition may use a serving or weight basis rather than a per-cake figure. | When sharing, I need to check the label for everyone eating the cakes and have somewhere to keep the remainder as instructed. |
Mistakes to avoid
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Counting every Jaffa Cake as the same portion
ASDA Groceries lists 7.6 g carbohydrate per cake for the checked McVitie’s 30-cake pack and 8.5 g for its 36-cake pack; Sainsbury’s lists 8.2 g for its 24-cake pack.
Use the per-cake figure on the pack you purchase when planning how many to carry.
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Planning around a listed pack without checking stock
The checked 36-cake ASDA Groceries listing was unavailable, while Sainsbury’s marked its 24-cake pack out of stock.
Check availability again before choosing a format for a group session or training trial.
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Treating mini cakes like standard-size cakes
M&S gives carbohydrate per 100 g for its minis, while Waitrose gives it per 25 g serving. Their allergy statements also need to be read separately.
Use the mini pack’s own serving information and allergen label rather than standard-cake figures.
Brand and pack references
These examples show why pack count and nutrition basis matter; a brand name alone does not identify the portion you will get.
McVitie’s
Original Jaffa Cakes in the larger 30- and 36-cake formats listed by ASDA Groceries.
- ASDA Groceries gives a per-cake carbohydrate figure for each checked format: 7.6 g for 30 cakes and 8.5 g for 36 cakes.
- The checked 36-cake listing was marked unavailable; the two formats should not be treated as interchangeable portions.
Sainsbury’s
An own-label 24-cake sharing multipack.
- Sainsbury’s lists 8.2 g carbohydrate per cake for the checked pack.
- The checked listing was out of stock. Check this pack’s ingredients and allergy advice in their own right.
Asda
An own-label 150 g pack listed as 12 servings by ASDA Groceries, for a smaller trial quantity.
- The listing gives 8.6 g carbohydrate per cake.
- Twelve servings provide fewer cakes to share than the checked 24-, 30- and 36-cake formats.
M&S
Mini Jaffa Cakes in a 100 g pack.
- M&S lists carbohydrate as 65.6 g per 100 g, giving a weight-based figure for this pack.
- That is not a per-mini-cake figure. The listing also warns that the product is unsuitable for people with a peanut allergy.
Waitrose
Own-label mini Jaffa Cakes in a 125 g bag.
- Waitrose lists 15.6 g carbohydrate per 25 g serving.
- The serving figure is not per mini cake, and the listing says the product may contain milk.
Joybuy pack options
These McVitie’s options cover a bulk supply, smaller three-cake snack packs and a triple pack. Choose the format for your sharing or carrying plans, and use the purchased pack’s label for portion information.
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McVitie’s 80 Jaffa Cakes 1.07kg
The 80-cake quantity suits a planned group supply or several training trials. Check this pack’s own nutrition and storage instructions when dividing it into portions.
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McVitie’s The Original Jaffa Cakes Snack Pack 6 x 3pk 198g
Six three-cake packs let you separate portions for smaller groups or training sessions. Check the pack’s nutrition label when counting carbohydrate.
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McVitie’s Jaffa Cakes Original Triple Pack 330g
The triple-pack format is an option for sharing. Check its cake count and per-cake nutrition on the pack before planning running portions; this 330 g product is distinct from the 30-cake format listed by ASDA Groceries.
Questions about training and sharing
Do I need Jaffa Cakes during every training run?
No. Science in Sport’s marathon-training guidance says food during an easy run under 60 minutes is usually unnecessary if you have already fuelled adequately. For longer or harder sessions, plan around the session and try any food you intend to eat while running in training.
How should I handle an opened sharing pack?
Check its storage instructions and portion out what you intend to carry before the run. The checked McVitie’s and Sainsbury’s listings advise keeping cakes cool and dry and using an airtight container after opening; a sharing carton is not itself an individual running portion.
What allergen information should I check before sharing?
Read the actual pack’s ingredients and allergen statement for each product. GOV.UK says regulated allergens present in prepacked food must be clearly labelled; do not assume a mini or own-label cake has the same statement as a branded standard-size cake.
What if a delivered pack is faulty or not as described?
GOV.UK says a retailer must offer a full refund for goods that are faulty or not as described. That is a different issue from changing your mind about a purchase; keep the order details and tell the seller what is wrong with the pack.