Travellers counting calories
If you are packing an individually wrapped snack, compare kcal for the complete bar. Pack sizes and protein claims do not tell you that total on their own.
Who is this for?
Travellers choosing by protein amount
If protein is the reason for buying a bar, compare grams of protein alongside whole-bar calories. The TREK, Fulfil and Grenade examples listed by Tesco Groceries offer different combinations of the two.
Plant-based or allergen-aware travellers
If you need a vegan bar or avoid particular ingredients, check the statement for the exact flavour. Tesco Groceries labels the cited TREK bar suitable for vegans, but that does not establish the ingredients of other bars.
What should you check?
Start with kcal and protein for one complete bar, then check whether its ingredients and your travel route affect the choice.
| Priority | What to check | Your needs |
|---|---|---|
| Whole-bar calories | Read kcal per bar, not just per 100g or a claim on the front. Check the flavour and bar size against your own allowance. | I want to know the calorie total for the snack I will actually eat. |
| Protein trade-off | Compare protein and kcal on the same per-bar basis. Tesco Groceries lists 12g at 159 kcal for TREK Choc Caramel, 18.9g at 186 kcal for Fulfil Chocolate Brownie, and 21g at 212 kcal for Grenade Chocolate Chip Cookie Dough. | I may prefer the lower-calorie TREK bar, or accept more calories for the protein amount in the cited Fulfil or Grenade bar. |
| Ingredients | Read the exact bar’s ingredients, allergen and may-contain statements. Check polyols if sweeteners matter to you; Tesco Groceries lists 17.8g in the cited Fulfil bar and 19g in the cited Grenade bar. | Before I pack a bar, I need to know whether its ingredients fit my dietary requirements. |
| Travel rules | Keep food accessible in hand luggage in case security needs to inspect it. Check the destination and any transit rules separately from departure screening. | I want a snack I can pack without assuming that passing airport security settles the rules at arrival. |
Common buying mistakes
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Assuming low sugar means low calorie
A sugar claim does not give the energy value of a complete bar. For example, Barebells lists 203 kcal for its 55g Salty Peanut bar, while PhD states 238 calories for the displayed Smart Bar.
Choose a calorie allowance that works for your snack, then read kcal per bar on the exact flavour and pack size.
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Choosing by calories without checking protein
In the Tesco Groceries examples, TREK Choc Caramel has 159 kcal and 12g protein per bar; Fulfil Chocolate Brownie has 186 kcal and 18.9g; Grenade Chocolate Chip Cookie Dough has 212 kcal and 21g.
Decide whether the lower calorie total or a different protein amount matters more for this snack.
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Overlooking ingredients in a wrapped bar
Individual wrapping does not establish whether a bar meets your dietary requirements. Tesco Groceries lists substantial polyol quantities for the cited Fulfil and Grenade bars, and ingredient statements differ by product.
Read the exact flavour’s ingredients, allergen and may-contain information, particularly if you have not eaten it before travelling.
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Confusing security screening with food-import rules
GOV.UK says food in hand luggage can obstruct an x-ray image and require a manual bag check. Rules for bringing food into Great Britain are a separate matter and can depend on the food and its origin.
Check the rules for your departure airport, transit points and destination before packing the bar.
Brand and retailer references
These examples show why the nutrition panel for a particular bar matters more than a brand name when choosing an airport snack.
Grenade
Tesco Groceries lists 212 kcal, 21g protein and 19g polyols per 60g Chocolate Chip Cookie Dough bar.
- The cited bar provides 21g protein.
- Its 212 kcal exceeds the totals for the cited TREK and Fulfil bars; check the ingredients of the exact variant.
PhD
PhD states 21g protein, 238 calories and 1g sugar for the Smart Bar displayed on its product page.
- The displayed figures let you compare protein, sugar and calories together.
- At 238 calories, that displayed bar has a higher energy total than the cited TREK, Fulfil and Grenade examples.
Myprotein
Myprotein states 30g protein per High-Protein Bar and lists hydrolysed collagen and milk protein among its ingredients.
- The stated protein amount may be relevant if that is your main selection criterion.
- Collagen and milk protein rule out this cited bar for vegans; check the exact flavour’s calorie and ingredient information.
Quest
Quest Nutrition states that its original protein bars contain up to 21g protein per bar and use sugar alcohols.
- Quest describes its protein bars as gluten-free.
- Use the nutrition and ingredient information for the exact bar you intend to buy rather than applying range-level statements to every variant.
Barebells
Barebells lists 203 kcal and 20g protein per 55g Salty Peanut bar in its UK/Ireland nutrition information.
- The cited product has a stated per-bar calorie and protein figure for comparison.
- Barebells says its products are not low- or reduced-calorie foods; the cited Salty Peanut bar contains milk and peanuts.
Tesco
Tesco Groceries provides product listings for the TREK, Fulfil and Grenade bars used in the per-bar comparison above.
- Its cited listings give kcal and protein for a specified bar size.
- A retailer’s protein-bar category includes products with different nutrition values; compare the individual listings.
Joybuy protein bar options
These Grenade multipacks are options to consider if you plan to pack a bar for an airport journey. Compare the label for one bar—not the whole multipack—with your calorie allowance and ingredient requirements.
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Grenade Soft Core Double Chocolate 50g, 12 × 50g
For an airport snack, compare the nutrition values for one 50g bar with your allowance, and check the Double Chocolate ingredients and allergen statement. This pack contains twelve 50g bars.
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Grenade Soft Core Golden Caramel 50g, 12 × 50g
If you are packing one bar, use the Golden Caramel label’s per-bar kcal and protein figures rather than values for the multipack. Check its ingredients, including allergen information, against your requirements; the pack contains twelve 50g bars.
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Grenade Soft Core Peanut Butter 50g, 12 × 50g
Check the Peanut Butter variant’s allergen statement before choosing it for travel, as well as kcal and protein per 50g bar. The product is a pack of twelve 50g bars.
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Grenade Oreo Flavour Protein Bar, 4 × 60g
If your airport-snack choice is led by calories, check kcal for one 60g Oreo Flavour bar alongside its protein, ingredients and allergen statement. This pack contains four 60g bars.
Frequently asked questions
Can I pack a protein bar in hand luggage at a UK airport?
You can pack a solid bar as food, but keep it accessible for screening. GOV.UK says food items in hand luggage can obstruct x-ray images and may require a manual bag check; check your airport and any transit requirements before travelling.
Is a low-sugar protein bar necessarily low in calories?
No: read kcal for the whole bar. Tesco Groceries lists 159 kcal for TREK High Protein Choc Caramel, 186 kcal for Fulfil Chocolate Brownie and 212 kcal for Grenade Chocolate Chip Cookie Dough, each at its stated bar size.
Which cited lower-calorie bar is labelled vegan?
Tesco Groceries labels TREK High Protein Choc Caramel suitable for vegans and lists 159 kcal and 12g protein per 44g bar. Check the full ingredient and may-contain statement if you also avoid allergens.
Should I check polyols before taking a bar on a flight?
Yes, if they matter to your choice: read the amount and any warning on the exact product. Tesco Groceries lists 17.8g polyols per cited Fulfil Chocolate Brownie bar and 19g per cited Grenade Chocolate Chip Cookie Dough bar; Myprotein warns that excessive consumption of its High-Protein Bar may have laxative effects.
Do airport-security rules also determine whether I can bring a bar into Great Britain?
No. GOV.UK treats hand-luggage screening and bringing food into Great Britain as separate questions. Check the bar’s ingredients, where you are travelling from and the applicable food-import rules before your return journey, particularly if it contains animal-derived ingredients.