Who is choosing the bar?

Students taking a snack for the day

A bar is easy to carry between lessons or lectures. Compare its fat per 100g as well as the amount in the bar you would actually eat; a protein claim alone does not answer the lower-fat question.

Parents choosing for teenagers

Check the exact flavour’s age warning and allergen statement before buying a multipack. Grenade states that its OREO Protein Bar is not suitable for children under 14, so the warning cannot be judged from the product category alone.

Shoppers comparing fat and saturated fat

Start with the per-100g figures to compare bars of different sizes, then read the per-bar values and any traffic-light labelling. Total fat and saturated fat are separate entries worth checking.

What should you compare?

Use the per-100g column to compare products, then the per-bar column to see what one snack contains. The NHS explains that nutrition information is given per 100g and sometimes per portion.

Priority What to check Your needs
Total fat Compare grams per 100g across bars. For a solid food labelled low fat, the UK criterion is no more than 3g fat per 100g, according to legislation.gov.uk. I’m looking for a bar lower in fat, not one that merely says it is high in protein or low in sugar.
Saturated fat Read saturated fat separately, per 100g and per bar. Check any traffic-light label against the nutrition table. Total fat matters to me, but I also want to see how much of it is saturated fat.
Bar size Note the bar’s weight, then compare its full-bar fat, saturated fat, protein and energy values. Do not compare only per-bar fat when the bars weigh different amounts. I want to know what the snack I’ll carry actually contains, without mistaking a smaller bar for a lower-fat recipe.
Age and ingredients Check the current pack’s age warning, ingredients, highlighted allergens and any excessive-consumption warning. Check the school’s packed-lunch and allergy policy where relevant. The bar needs to be appropriate for the person eating it and for the place they’ll take it.

Common buying mistakes

  • Treating low sugar as low fat

    Sugar, protein and total fat are different label measures. The PhD Chocolate Brownie, Barebells Salty Peanut and TREK Choc Caramel examples list 14g, 15g and 16g fat per 100g respectively on the cited PhD, Barebells and Tesco product pages.

    For a lower-fat choice, compare total fat per 100g first. Check saturated fat and the full-bar serving before deciding.

  • Comparing bars only by serving

    A 44g bar and a 64g bar contain different-sized portions. Per-bar figures tell you about one snack, but do not provide a like-for-like comparison of the recipes.

    Compare fat and saturated fat per 100g, then return to the figures for the whole bar you plan to eat.

  • Overlooking warnings on the exact flavour

    Grenade’s OREO Protein Bar carries an under-14 warning. Grenade and Barebells also give excessive-consumption laxative-effect warnings on the cited product pages; allergen information differs by bar.

    Read the current pack’s age, allergen and sweetener information before choosing a bar for a student.

  • Assuming one school rule covers every snack

    Rules about food supplied by a school and a school’s policy for food brought from home are different questions. A product label does not tell you what an individual school permits in a packed lunch.

    Ask the school about its packed-lunch and allergy policy, and check the bar’s own warnings separately.

Brand and product references

These figures concern the named flavours, not every bar made by each brand. Compare the current label when choosing a different variety.

Myprotein

The Jimmy’s Iced Coffee Layered Bar Mocha is a 60g bar. Myprotein lists 9.1g fat per 100g and 5.5g per bar for this flavour.

  • Its listed total-fat figure is lower than those of the three other named flavours compared here.
  • At 9.1g fat per 100g, this flavour is above the UK low-fat criterion for solid foods; its figures do not apply to every Layered Bar.

PhD

PhD’s Smart Bar Chocolate Brownie is a 64g bar. Its product listing gives 14g fat per 100g and 9.2g per bar.

  • The listing gives 21g protein per Chocolate Brownie bar.
  • The same flavour lists 5.2g saturated fat per 100g and carries an excessive-consumption warning. Its total-fat figure is above the UK low-fat criterion.

Barebells

Barebells lists its Salty Peanut protein bar as a 55g serving, with 15g fat per 100g and 8.2g per bar.

  • The Salty Peanut listing gives 20g protein per bar.
  • This flavour contains milk, peanuts and soya, may contain gluten and nuts, and lists 6.5g saturated fat per 100g.

Grenade

Grenade markets its OREO Protein Bar as a high-protein snack; its UK product page states 21g protein.

  • The product page makes its age warning clear: this flavour is not suitable for children under 14.
  • Check the current pack’s fat values, allergens and excessive-consumption warning before considering it for school use.

TREK

Tesco lists the vegan TREK High Protein Low Sugar Choc Caramel bar as a 44g serving with 12g plant protein.

  • The vegan formulation is relevant when plant-based ingredients are a requirement.
  • Tesco lists 16g fat and 9.8g saturated fat per 100g for this flavour, so being vegan does not make it low fat.

A protein bar on Joybuy

This Nature Valley multipack is a portable protein-bar option for the back-to-school scenario. If lower fat is the deciding factor, check its fat figure before choosing it.

Nature Valley Protein Peanut & Chocolate Bar, pack of four 40g bars

Nature Valley Protein Peanut & Chocolate Bar, 4 x 40g

The 4 x 40g pack offers individually sized bars for a school bag. The product information gives 30g fat per 100g, above the UK low-fat criterion for solid foods; check the current pack’s nutrition and peanut, soya and milk allergen statements before use.

View on Joybuy

Questions about school snacks

What counts as a low-fat protein bar in the UK?

For a solid food, the UK low-fat labelling criterion is no more than 3g total fat per 100g, according to legislation.gov.uk. Read the per-100g nutrition table: a high-protein or low-sugar claim does not establish that a bar meets this criterion.

Should I compare total fat or saturated fat?

Compare both figures on the exact bar’s label. Total fat addresses the lower-fat choice directly, while the separate saturated-fat figure helps you see what the total includes; compare per 100g first and then per bar.

Can I put a protein bar in a school packed lunch?

Check the school’s packed-lunch and allergy policy before sending one, alongside the product’s age and allergen warnings. Rules concerning food provided by a school do not, by themselves, tell you what that school permits in a lunch brought from home.

Are all protein bars suitable for children under 14?

Do not assume they are. Grenade states that its UK OREO Protein Bar is not suitable for children under 14; read the current warning on the exact product and flavour you are considering.

What allergen checks matter for a school snack?

Read both the ingredients and any may-contain statement on the exact pack, then check the school’s allergy policy. Barebells lists milk, peanuts and soya in its Salty Peanut bar and says it may contain gluten and nuts; those details must not be assumed for other flavours.