Tea-break snackers watching portion calories
If you plan to eat one packaged bar with a drink, start with kcal per bar. Compare kcal per 100 g as well when bar sizes differ; a smaller serving does not necessarily mean a less energy-dense product.
Who is choosing?
Shoppers with dietary restrictions
If you need a vegan, gluten-free or dairy-free bar, check those statements on the exact product. Sainsbury’s lists nākd. Blueberry Muffin as suitable for vegans and free from gluten and dairy; ingredient and may-contain statements still matter for other requirements.
Snackers choosing for protein and fibre
If protein matters more to you than the smallest calorie figure, compare the amounts per bar alongside its calories. Nature Valley lists around 10 g protein, around 4 g fibre and 196 kcal for a 40 g Protein Peanut & Chocolate bar.
What should you compare?
Start with the serving you would actually eat, then check the per-100 g panel and any dietary requirements that could rule a bar out.
| Priority | What to check | Your needs |
|---|---|---|
| Portion calories | Read kcal per bar or labelled serving, including whether a serving contains more than one bar. Compare kcal per 100 g when pack sizes differ. | I want to know the calories in the amount I will eat with my afternoon drink, rather than judge a bar by its size alone. |
| Sugars | Compare total sugars for the serving you will eat and per 100 g. Read the ingredient list alongside any front-of-pack claim. | A fruit, oat or protein description does not answer my question about sugars. Tesco lists 2.7 g sugars for a 30 g Graze Cocoa Vanilla Oat Boost; Sainsbury’s lists 17 g for a 35 g nākd. Blueberry Muffin bar. |
| Protein and fibre | Check grams of each nutrient per labelled bar, then read the kcal for that same portion. Keep serving sizes in view when comparing products. | If I am choosing a bar for its stated protein or fibre amount, I still want to know how it compares with a smaller-portion option. Nature Valley lists around 10 g protein and around 4 g fibre per 40 g Protein Peanut & Chocolate bar. |
| Dietary suitability | Check the exact recipe’s suitability statements, ingredients and contains and may-contain warnings. Do not apply one variant’s label to a whole brand. | For an allergy or another ingredient restriction, I need the information on the precise bar I am buying, even if its front label says vegan or gluten free. |
Common buying mistakes
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Calling a small bar low energy because its serving has fewer calories
A small serving can have fewer kcal while the food remains much more energy-dense per 100 g. The two figures answer different buying questions.
Compare kcal for the amount you expect to eat, then use kcal per 100 g to compare bars of different sizes.
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Using one favourable claim as a shortcut for the whole nutrition panel
Fruit, oats, protein and fibre descriptions do not tell you the total sugars in a serving. Action on Salt and Sugar reported in its 2025 UK snack-bar review that 37% of the bars assessed would be high in sugars.
Read sugars, calories and saturated fat on the nutrition panel rather than choosing on a single front-of-pack claim.
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Overlooking ingredients after checking a suitability label
A vegan or gluten-free statement does not answer every allergen question. The Joybuy listing for Nature Valley Protein Peanut & Chocolate, for example, lists peanuts, soya and milk as ingredients requiring allergen attention.
For the bar you intend to buy, read both its contains and may-contain statements against your requirements.
Brand references for different bar formats
Graze
Graze’s Cocoa Vanilla Oat Boost is an example of a small oat-flapjack portion to compare for a tea break.
- Tesco lists 116 kcal and 2.7 g sugars per 30 g boost and describes it as high in fibre.
- Its serving calorie figure alone does not establish that the product is low energy. Check the exact pack’s ingredients and per-100 g panel.
nākd.
The Blueberry Muffin fruit-and-nut bar is a reference for shoppers comparing a stated vegan, gluten-free and dairy-free format.
- Sainsbury’s lists 131 kcal and 3.3 g fibre per 35 g bar.
- The same listing gives 17 g sugars per bar. Check the precise pack’s nut ingredients and may-contain information.
Nature Valley
Its oat and protein bars show why the labelled serving matters when comparing formats.
- Nature Valley lists around 10 g protein and around 4 g fibre per 40 g Protein Peanut & Chocolate bar.
- That bar has 196 kcal per serving. Nature Valley also lists 196 kcal for a two-bar, 42 g serving of Crunchy Oats & Honey; check serving definitions before comparing the two.
TREK
TREK provides protein-led bars for shoppers considering that nutrient alongside portion calories.
- TREK states 9 g plant-based protein for its Protein Flapjacks and 15 g for its High Protein bars.
- Compare the calorie and ingredient panels for the particular TREK bar rather than using its protein amount as a calorie comparison.
Eat Natural
Its fruit-and-nut bars offer another format to assess against your dietary and portion requirements.
- Tesco describes its Cranberries, Almonds & Dark Chocolate bars as gluten free and individually wrapped.
- Allergens vary by product: ASDA lists peanuts and soya for the separate Eat Natural Protein Peanuts & Dark Chocolate variant. Check the exact pack.
Snack bars on Joybuy
These Joybuy options include a small oat-bar portion and several protein-focused bars for an afternoon break. Compare each exact product’s nutrition panel before deciding which portion and format fits your needs.
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Grenade Soft Core Double Chocolate Protein Bar, 12 × 50 g
Consider this protein-bar format if protein is a priority for your afternoon snack. Compare calories and sugars per 50 g bar on the pack, and check the ingredient and allergen statements.
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Graze Oat Boosts Cherry Bakewell, 4 × 30 g
The 30 g oat-bar format may suit a tea break where you plan to eat one smaller portion. Check this Cherry Bakewell variant’s own kcal, sugars and allergen information rather than applying figures from another Graze flavour.
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Grenade Soft Core Golden Caramel Protein Bar, 12 × 50 g
This is another 50 g protein-bar option for a tea break. Use its own per-bar nutrition panel to compare it with Double Chocolate, and read the exact pack’s allergen statement.
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Grenade Soft Core Peanut Butter Protein Bar, 12 × 50 g
If you are considering this 50 g protein bar, check its per-bar calories as well as its ingredients. The peanut variant warrants particular attention to the pack’s allergen and may-contain statements.
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Grenade Oreo Flavour Protein Bar, 4 × 60 g
Its 60 g bar is a different portion size from the 50 g Grenade variants above. Compare kcal per bar as well as per 100 g, then check the ingredients and allergens on this flavour’s pack.
Questions about choosing a bar
Should I compare calories per bar or per 100 g?
Use both: kcal per bar describes the portion you intend to eat, while kcal per 100 g helps you compare different bar sizes. Tesco lists 116 kcal for a 30 g Graze Cocoa Vanilla Oat Boost; Sainsbury’s lists 131 kcal for a 35 g nākd. Blueberry Muffin bar.
Does a smaller bar automatically count as low energy?
No. Fewer calories in a small serving do not, on their own, establish a low-energy claim for the food. Check its energy per 100 g separately from the calories in the portion you expect to eat.
Is a protein bar necessarily the lighter tea-break option?
No. Nature Valley lists around 10 g protein, around 4 g fibre and 196 kcal for its 40 g Protein Peanut & Chocolate bar. If portion calories matter most, compare that whole-bar figure with other bars rather than deciding from the protein description.
Does vegan or gluten-free labelling answer every allergen question?
No. Those statements address particular requirements, not every ingredient or possible cross-contact warning. Read the contains and may-contain information on the exact bar before buying it for an allergy-related requirement.