Shoppers prioritising lower fat
If total fat is the deciding factor, use the per-100g nutrition figure. Protein, fibre and ingredient descriptions answer different questions.
Who is comparing these bars?
Portion-conscious snack shoppers
If you usually eat a whole bar, compare its stated energy and nutrients with its weight. A per-100g comparison alone does not show what that portion contains.
Shoppers with dietary restrictions
If ingredients or allergens limit your choices, check the exact bar’s current pack. The brand examples include bars containing nuts or other declared allergens.
What should you check?
Start with total fat per 100g if low fat is your firm criterion, then use the bar’s portion information to judge the snack you would eat.
| Priority | What to check | Your needs |
|---|---|---|
| Total fat | Read total fat per 100g, then per bar. Business Companion’s September 2026 UK guidance permits a low-fat claim for a solid food only at no more than 3g fat per 100g; other nutrient claims do not establish this. | I want to distinguish a bar labelled low fat from one promoted for protein, fibre or its ingredients. |
| Portion and energy | Compare energy per 100g and for the bar or portion you intend to eat. The NHS explains that nutrition information is given per 100g and sometimes per portion. | If I eat the whole bar, I want its portion figures alongside a like-for-like comparison with other bars. |
| Other nutrients and ingredients | Check sugars, fibre and protein on a consistent portion basis. Read the ingredients and allergen statements for the exact product. | Protein or fibre might matter to me, but I still need to compare fat and check whether the ingredients meet my dietary requirements. |
Common buying mistakes
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Treating protein or no added sugar as a low-fat claim
These descriptions refer to different properties. For example, Tesco lists Graze Cherry Bakewell Oat Boost at 22g fat per 100g, despite its place in a range Graze promotes for its sugar content.
Check total fat per 100g first if low fat is your criterion; compare the other nutrients separately.
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Overlooking the size of the bar
Per-100g figures help with like-for-like comparisons, but they do not describe the portion you eat. Tesco lists 131 kcal and 6.7g fat for one 30g Graze Cherry Bakewell Oat Boost bar.
Use both the per-100g column and the figures for your intended portion.
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Assuming a fruit-and-nut bar suits every allergy
nākd. says all its bars contain nuts and may contain traces of other nuts or peanuts. Ingredient descriptions are not a substitute for an allergen declaration.
Read the current pack’s ingredients and precautionary allergen statement for the exact variant.
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Relying on an old ‘light’ bar listing
Alpen’s FAQ names Alpen Light Bars Chocolate & Orange among products it no longer makes. An older listing may not describe a current product.
Confirm the exact variant and read its current nutrition panel before comparing it with other bars.
Brand references
Compare the exact bar rather than applying one product’s nutrition figures to an entire brand range.
Graze
Graze’s Oat Boost range includes individually portioned flapjacks.
- Tesco lists the Cherry Bakewell Oat Boost at 131 kcal per 30g bar.
- The same Tesco listing gives 22g total fat per 100g; the range’s sugar messaging is not a low-fat claim.
Nature Valley
Nature Valley offers crunchy, oat and protein bar formats.
- Nature Valley lists around 10g protein and 196 kcal in its 40g Peanut & Chocolate Protein Bar.
- Protein content alone does not establish that a bar is low in fat; check the exact variant’s nutrition panel.
Eat Natural
Eat Natural’s range includes nut-based protein bars.
- Eat Natural lists its Dark Chocolate & Peanut Protein Bar as a 40g portion.
- The brand lists 220 kcal and 14.5g fat per bar. Check ingredients if peanuts or other allergens affect your choice.
nākd.
nākd. describes its fruit-and-nut bars as having no added sugar and being suitable for vegetarians and vegans.
- Its no-added-sugar and dietary-format descriptions may help narrow a choice based on those requirements.
- nākd. says all its bars contain nuts and may contain traces of other nuts or peanuts. No-added-sugar wording does not state total fat.
Trek
Trek Protein Flapjack is an oat-based protein-bar example.
- Nutracheck lists 10g protein for a 50g Trek Protein Flapjack serving.
- Nutracheck also lists 10.5g fat for that serving. Check the current pack for the exact variant before using those figures to compare bars.
Alpen
Older Alpen Light bar names can appear in snack-bar comparisons.
- Alpen names Chocolate & Orange Alpen Light Bars among products it no longer makes. Check the exact current product rather than relying on an older listing.
Joybuy snack-bar options
These Joybuy options cover portioned cereal, oat and protein bars. Compare each exact variant’s current nutrition panel; being listed here does not mean it qualifies for a low-fat claim.
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Special K Dark Chocolate Snack, 6 × 21.5g
The 21.5g bar size gives you a defined portion to compare. Check total fat per 100g and energy per bar on the current pack before treating it as a lower-fat choice.
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Graze Protein Bites Cocoa, Vanilla Oat Squares, 4 × 30g
For an oat-based snack in 30g squares, compare the current per-square energy figure with total fat per 100g. Protein or sugar messaging should not replace that fat check.
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Kellogg's Strawberry Nutri Grain Bars, 6 pack, 222g
If you are comparing cereal bars, check the serving information for this six-pack alongside fat per 100g. Read the current ingredients and allergen statement if dietary restrictions affect your choice.
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Grenade Soft Core Double Chocolate Protein Bars, 12 × 50g
If you are considering a protein bar, assess its 50g serving as well as fat per 100g. Protein in the product name does not establish a low-fat claim.
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Grenade Soft Core Golden Caramel Protein Bars, 12 × 50g
This Golden Caramel variant also comes as 50g bars. Compare its own nutrition and allergen information rather than applying figures from the Double Chocolate variant.
Questions about snack-bar labels
What counts as a low-fat snack bar in the UK?
Business Companion’s September 2026 UK guidance says a solid food can make a low-fat claim only if it contains no more than 3g fat per 100g. Check the per-100g total-fat figure, not just the amount in one bar.
Does reduced sugar mean reduced fat?
No. Sugar and total fat are separate figures. Graze promotes its Oat Boost range for its sugar content, while Tesco lists 22g fat per 100g for the Cherry Bakewell Oat Boost variant; check the exact bar you intend to buy.
Should I compare snack bars per bar or per 100g?
Use both: per 100g allows a like-for-like comparison, while per-bar figures describe a stated portion. The NHS explains that nutrition information is given per 100g and sometimes per portion, so check how much you expect to eat.
Does a protein bar meet a low-fat priority?
Its protein content cannot answer that question; check total fat per 100g. Nature Valley lists around 10g protein and 196 kcal for its 40g Peanut & Chocolate Protein Bar, illustrating why the rest of the nutrition panel still matters.
What should I check if I have a nut allergy?
Read the current pack’s ingredients and allergen statements for the exact bar. nākd. states that all its bars contain nuts and may contain traces of other nuts or peanuts, so a general fruit-and-nut description is not enough to assess suitability.