Commuters comparing portions
If you carry a bar for later, compare calories for the whole bar as well as its weight. A 25g fruit bar and a 50g flapjack are different-sized snacks, even when both come in individual portions.
Who is choosing a lunch-bag bar?
Workers choosing a more substantial snack
If protein or fibre matters more than the smallest calorie figure, compare the amount per bar alongside its calories. Nature Valley lists about 10g protein for its 40g Peanut & Chocolate Protein Bar, which has 196 kcal.
Shoppers checking dietary suitability
Check claims and allergens for the exact variety. Vegan or gluten-free wording does not replace an ingredient list or a may-contain statement, especially when choosing between fruit-and-nut, oat and protein bars.
What should you compare?
Start with the portion you expect to eat, then use the per-100g panel to compare differently sized bars. Read the ingredient and allergen information before settling on a flavour or format.
| Priority | What to check | Your needs |
|---|---|---|
| Calories and portion | Compare kcal per bar, bar weight and kcal per 100g. If a pack contains more than one bar, check what its stated serving includes. | I want a portion that fits my lunch or snack plan, rather than choosing a small bar from its front-of-pack number alone. |
| Total sugars | Read sugars per bar and per 100g, then the ingredients list. According to the NHS, more than 22.5g sugars per 100g is high on its food-label guide. | A fruit or oat bar appeals to me, but I also want to know its total sugars; “no added sugar” does not answer that question. |
| Protein and fibre | Compare stated grams per bar with calories for the same serving. Check whether a fibre description applies to the exact variety. | If I am choosing a protein-led snack, I can accept a different calorie figure from the one I would choose for a small bar. |
| Allergens and diet | Read the current pack’s ingredients, allergen emphasis and may-contain statement. Check vegan or gluten-free wording on the exact product. | I need the particular bar I pack for lunch to meet my dietary requirements, not just its general product category. |
Common buying mistakes
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Assuming fewer calories per bar means less sugar
Eat Natural lists 86 kcal and 13.8g sugars for its 25g Apple Soft Fruit Bar. Nakd lists 155 kcal and 12g sugars for a 35g Bakewell Tart. Calories and total sugars answer different questions.
Compare both figures for the portion you will eat, then use the per-100g panel when bar sizes differ.
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Choosing a protein bar for a small-calorie snack
Nature Valley lists 196 kcal and about 10g protein for its 40g Peanut & Chocolate Protein Bar; TREK lists 219 kcal and 10g protein for a 50g Original Oat bar. Neither protein figure tells you the calorie count.
Decide whether portion calories or protein per bar matters more for this snack, and compare both on the same serving basis.
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Using a dietary claim in place of an allergen check
Nakd Bakewell Tart contains cashews, while Nature Valley Protein Peanut & Chocolate contains peanuts, soya and milk. Their ingredients and may-contain statements matter independently of other pack claims.
Read the current label for the exact flavour and pack before buying or eating it.
Brand and product references
These figures describe the named varieties and serving sizes, not every bar from each brand.
Eat Natural
Eat Natural lists its individually wrapped Apple Soft Fruit Bar at 86 kcal per 25g bar.
- The named bar is labelled vegan, gluten free and a source of fibre.
- It lists 13.8g sugars per bar and contains almonds; check its may-contain statement.
Graze
Waitrose lists the 30g Lemon Blueberry Oat Boost at 128 kcal and 3.8g sugars per bar.
- This variety is labelled high in fibre and suitable for vegans.
- It lists 428 kcal per 100g. Check the pack’s allergen and may-contain information.
Nakd
Nakd lists its Bakewell Tart fruit-and-nut bar at 155 kcal per 35g serving.
- The named bar is labelled vegan, gluten free, dairy free and made with no added sugar.
- It still lists 12g total sugars per bar, contains cashews and may contain other nuts.
Nature Valley
Nature Valley lists about 10g protein, about 4g fibre and 196 kcal for one 40g Peanut & Chocolate Protein Bar.
- Its protein figure gives shoppers a concrete measure to compare per bar.
- The named protein bar contains peanuts, soya and milk; its 196 kcal serving is a different choice from a smaller-calorie bar.
TREK
TREK lists 10g plant protein and 219 kcal for its 50g Original Oat flapjack.
- The named bar is labelled vegan, gluten free and a source of fibre.
- It lists 12g sugars per bar and may contain peanuts, nuts and milk.
Alpen
Weetabix Cereals presents Alpen Light Summer Fruit as a 19g multigrain bar.
- Its nutrition table lists 65 kcal for one 19g bar.
- The same product page also says 67 calories per bar. Check the current pack for a calorie-specific comparison and read its allergen statement.
Snack bars on Joybuy
These Joybuy options include small cereal-bar portions, oat-bar multipacks and a protein-bar multipack for comparing what to pack with lunch. Check the serving and nutrition panel on the particular pack before choosing.
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Graze Oat Boosts Lemon Blueberry, 4 x 30g
An oat-bar portion to compare with smaller fruit bars. Waitrose lists 128 kcal and 3.8g sugars per 30g Lemon Blueberry Oat Boost and labels it high in fibre and suitable for vegans; check the current pack’s allergen statement.
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Grenade Soft Core Double Chocolate Protein Bars, 12 x 50g
A protein-bar multipack for a protein-led snack choice. Each bar is listed as 50g; compare its nutrition per bar with smaller portions and check the current allergen label.
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Graze Oat Boosts Cherry Bakewell, 4 x 30g
Another 30g oat-bar option to pack with lunch. Compare the Cherry Bakewell variety’s own calories, sugars and fibre on the current pack rather than using figures for Lemon Blueberry.
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Special K Dark Chocolate Snack Bars, 6 x 21.5g
The listed 21.5g bar is a smaller portion than the 30g and 50g options here. Check its calories and sugars both per bar and per 100g, as well as the current allergen label.
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Nature Valley Sweet & Salty Nut Dark Chocolate with Nuts, 4 x 30g
A 30g nut-and-chocolate bar option. Compare the nutrition panel for this Sweet & Salty variety, and check its current ingredient and allergen statements before packing it.
Frequently asked questions
How do I compare calories when snack bars are different sizes?
Use calories per bar for the amount you expect to eat, then compare calories per 100g across different bar sizes. The NHS notes that labels give nutrition per 100g or 100ml and sometimes per portion; the stated portion may differ from what you eat.
Does “no added sugar” mean a bar has little sugar?
No. “No added sugar” does not describe the total-sugars figure. Nakd lists no added sugar for its Bakewell Tart bar, but its nutrition panel gives 12g sugars per 35g bar. Read the total-sugars line and ingredients for the exact product.
Are oat, fruit or protein bars automatically suitable for someone avoiding allergens?
No. Check the ingredients and may-contain statement on the current pack. For example, Nature Valley says its Protein Peanut & Chocolate Bar contains peanuts, soya and milk, while its Crunchy Oats & Dark Chocolate variety contains oat gluten. A claim about one variety does not establish the suitability of another.