Evening snack shoppers
If you want a packaged bar with a TV dinner, the amount in one bar matters for the portion you eat. The per-100-g figure answers a different question: whether the product meets a low-fat claim condition.
Who is this for?
People comparing bar labels
Oat, fruit, chocolate, nut and protein bars can differ in their declared fat, saturated fat, sugars and calories. Compare the exact flavours rather than relying on the type of bar.
Allergen-aware buyers
Check the current ingredients and any ‘may contain’ statement for the exact bar. Relevant ingredients across cereal-bar ranges include wheat, barley, oats, milk, soya, peanuts and tree nuts.
What should you check?
Start with the fat claim you need the bar to meet, then compare the portion you would actually eat and the rest of its label.
| Priority | What to check | Your needs |
|---|---|---|
| Fat claim | For a solid food labelled ‘low fat’, check for no more than 3 g fat per 100 g. For ‘reduced fat’, check the similar product used for comparison and a reduction of at least 30%. These are UK nutrition-claims conditions published on legislation.gov.uk. | ‘I want a bar that meets a defined fat claim, not one that merely sounds lighter.’ |
| Serving size | Read the stated weight and fat per bar as well as per 100 g. Check how many wrapped bars you intend to eat. | ‘One bar is the portion I am considering alongside dinner; its serving figures help me compare that choice.’ |
| Other label figures | Compare saturated fat, sugars and calories alongside total fat. Where present, traffic-light labels show high, medium or low amounts of fat, saturated fat, sugars and salt, according to GOV.UK. | ‘A lower fat figure alone does not tell me what the rest of the bar’s label says.’ |
| Bar type | Check the exact nutrition declaration for oat, nut, chocolate and protein variants. Ingredient or protein wording does not establish a reduced-fat claim. | ‘I may prefer a particular flavour or format, but I still want to compare its fat declaration.’ |
| Ingredients | Read the current ingredient list and any precautionary allergen statement for the exact flavour, particularly when choosing a multipack for someone else. | ‘An ingredient or allergen can rule out a bar for me regardless of its fat figures.’ |
Common buying mistakes
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Reading a small per-bar figure as a low-fat claim
A small bar can have little fat per serving yet exceed the UK low-fat limit of 3 g per 100 g. Kellogg’s UK lists its Special K Red Berry Bar at 1.7 g fat per 27 g bar and 6.3 g per 100 g.
If a low-fat claim matters to you, use the exact product’s per-100-g declaration; use the per-bar figure to assess the portion instead.
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Checking total fat but overlooking other figures
In its 2025 review of supermarket snack bars, Action on Salt & Sugar reported that 37% would be high in sugars and 55% high in saturated fat under UK traffic-light thresholds. These figures describe products in that review, not shoppers’ preferences.
Compare saturated fat and sugars alongside total fat and calories on the bars you are considering.
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Assuming another descriptor means reduced fat
Protein, wholegrain, vegan and gluten-free wording describes other attributes. It does not tell you whether a bar meets a reduced-fat condition.
Use those descriptors to choose a type of bar, then check the fat declaration and any comparison behind a reduced-fat claim.
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Choosing a multipack without checking the exact flavour
Ingredients and allergen information matter independently of the nutrition figures. Cereal-bar examples include products containing cereals with gluten, milk, soya, peanuts or tree nuts.
Read the current pack’s ingredients and any ‘may contain’ statement for the flavour you plan to buy.
Relevant brand ranges
These brand examples describe particular bars or ranges, not a reduced-fat classification for every product they make.
Kellogg’s Special K
Kellogg’s UK describes its Red Berry Bar as a cereal bar with cranberry pieces and a yoghurt-flavour topping.
- The manufacturer declares 1.7 g fat per 27 g Red Berry Bar, a useful figure for comparing single-bar portions.
- It also declares 6.3 g fat per 100 g, above the UK low-fat claim limit published on legislation.gov.uk. Check the pack for ingredients and allergens.
Nature Valley
Nature Valley UK lists Crunchy oat bars alongside protein and other bar varieties.
- Its Crunchy Variety Pack lists wholegrain rolled oats; its range also includes a Protein Peanut & Chocolate variant listed with 10 g protein and 4 g fibre.
- Neither oats nor protein establishes reduced-fat suitability. Compare the nutrition and ingredients of the exact variety.
Graze
Waitrose & Partners lists Graze Cocoa Vanilla Oat Boosts as wholegrain oat flapjacks with cocoa, chocolate and vanilla flavouring.
- The listing states 116 kcal per boost and describes the product as suitable for vegans.
- Those details do not establish a reduced-fat claim. Check the current fat declaration for the exact pack.
Eat Natural
Eat Natural UK lists fruit-and-nut and protein cereal bars, including a dark chocolate and peanut protein bar.
- The range offers a nut-and-fruit format for shoppers who want those ingredients.
- Protein wording is not a fat comparison. The dark chocolate and peanut product also calls for careful checking of peanuts and its other allergen information.
TREK
Tesco lists TREK Smooth Lemon Protein Flapjack as a plant-protein bar described as vegan and gluten free.
- Those stated attributes may help shoppers looking for that particular bar format.
- Vegan and gluten-free descriptions do not indicate reduced fat; check the exact flavour’s nutrition panel.
Joybuy bar options
These cereal and protein bars offer different formats for an evening snack. Their inclusion does not make them low-fat or reduced-fat choices; check the current nutrition and ingredient labels against your priorities.
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Cadbury Brunch Light Orange Cereal Bar, 4pk 104g
If you are considering one bar alongside dinner, compare its per-bar figures with its per-100-g declaration. This is a four-pack with a stated total weight of 104 g; ‘Light’ in the name is not a substitute for checking the fat claim and nutrition panel.
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Special K Red Berry Cereal Bar, 6 x 21.5g
The six individually sized bars provide a defined portion to consider with a TV dinner. Check this 21.5 g variant’s own per-bar and per-100-g labels; figures for a different Red Berry Bar pack should not be assumed to apply.
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Special K Dark Chocolate Snack, 6 x 21.5g
If you prefer a chocolate-flavour bar for an evening snack, compare its fat, saturated fat and sugars with other bars of interest. The pack contains six 21.5 g bars; the portion size alone does not establish a low-fat claim.
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Grenade Soft Core Golden Caramel Protein Bar, 12 x 50g
This protein-bar format is an alternative to a conventional cereal bar if that is the type of snack you want. The pack contains twelve 50 g bars; check the fat declaration and ingredients rather than treating protein wording as a reduced-fat claim.
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Grenade High Protein Low Sugar Protein Bar Oreo Flavour, 4 x 60g
If this protein-bar format appeals more than a cereal bar, assess it against your fat requirement separately. The pack contains four 60 g bars; the protein and sugar wording in its name does not establish a low-fat or reduced-fat claim.
Questions about cereal bars and fat
What counts as a low-fat cereal bar in the UK?
A solid food making a ‘low fat’ claim must contain no more than 3 g fat per 100 g under the UK nutrition-claims conditions published on legislation.gov.uk. Check the exact bar’s per-100-g declaration, not just its figure per serving.
Does ‘reduced fat’ mean the bar is low in fat?
No. Under the UK nutrition-claims conditions published on legislation.gov.uk, a reduced-fat claim requires at least 30% less fat than a similar product; it does not itself mean the bar meets the separate 3 g-per-100-g low-fat limit. Check the comparison behind the claim and the bar’s own fat declaration.
Is fat per bar enough to compare TV-dinner snacks?
Use fat per bar to assess the portion you plan to eat, but use per-100-g figures to compare bars of different sizes and to assess a low-fat claim. Check saturated fat, sugars and calories too; GOV.UK explains that traffic-light labels, where present, describe amounts of fat, saturated fat, sugars and salt.
Are oat or protein bars automatically reduced fat?
No. Oat and protein descriptions identify other product attributes, not a reduced-fat comparison. Check the nutrition declaration for the exact flavour and, if it makes a reduced-fat claim, the similar product used as its comparison.
Which allergen details should I check?
Read the current ingredients and any precautionary ‘may contain’ statement for the exact bar. Cereal and protein-bar examples contain or may contain ingredients such as cereals with gluten, milk, soya, peanuts and tree nuts; do not assume that another flavour has the same recipe.