Travellers comparing calories
If you want to plan what you will eat between stations, check the calories for the entire bar and its weight. A nutrition figure for a smaller serving may not describe the snack you intend to pack.
Who is this for?
Travellers looking for more protein
If your journey leaves a longer gap before your next meal, compare protein and calories together. The researched 60g Grenade bars provide more protein per bar than the named 45g examples, but also have more calories per bar, according to ASDA, Tesco and Myprotein UK.
Travellers checking ingredients
If allergens or sweeteners affect which foods you choose, read the current wrapper before eating. The researched bars have differing ingredient and cross-contact warnings, and some warn that excessive consumption may have a laxative effect.
What should you check?
Start with the complete bar you plan to eat, then compare its protein, pack format and ingredient information.
| Priority | What to check | Your needs |
|---|---|---|
| Calories per bar | Find the kcal for one complete bar and check its weight. Compare the same measure across products; a low-sugar statement does not give you the calorie figure. | I want to know what one packed snack contributes, especially if I might eat more than one during the journey. |
| Protein per bar | Read grams of protein for the whole bar, not just per 100g. Myprotein UK lists 18g per 45g Lean Protein Bar; ASDA and Tesco list 21–22g per 60g bar for the researched Grenade flavours. | For a longer gap before my next meal, I may prefer a bar with more protein, provided its calories also fit what I plan to eat. |
| Pack format | Check bar weight, how many bars are in the pack and whether each is individually wrapped. Follow the storage instructions on the product you take. | A single bar that I can carry and eat without preparation is easier to plan around on the train. |
| Ingredients | Read the current ingredients, allergen and ‘may contain’ statements. Check sweeteners or polyols and any on-pack warning about excessive consumption. | If an ingredient matters to me, I need to check the bar in my hand rather than rely on a product listing I read earlier. |
Common buying mistakes
-
Equating low sugar with fewer calories
Low sugar does not tell you the energy value of a bar. Tesco lists 1.3g sugars but 222 kcal for one 60g Grenade Chocolate Chip Salted Caramel bar.
Check kcal for the complete bar first, then compare protein, sugars and other nutrition figures that matter to you.
-
Comparing protein per 100g when you will eat one bar
Different bar weights make per-100g figures a poor substitute for checking the portion you will actually pack. Myprotein UK lists its Lean Protein Bar as 45g, while the researched Grenade bars are 60g.
Put bar weight, kcal per bar and protein per bar side by side before choosing a single bar or multipack.
-
Overlooking sweetener warnings before travel
The researched Myprotein, Barebells and Grenade listings warn that excessive consumption may have a laxative effect. That warning matters if you are thinking of packing several bars for one journey.
Read the ingredients and pack guidance, particularly if you have not eaten that product before.
-
Using an online listing in place of the current wrapper
Tesco advises shoppers to read the physical label because food products can be reformulated. Its Fulfil Chocolate Brownie 40g page also gives conflicting calorie figures of 135 kcal and 142 kcal.
Check the wrapper before eating, especially when an allergen or a specific per-bar calorie figure determines your choice.
Brand references for comparing bars
These examples describe particular products or listings, not every bar made or stocked by each brand.
Myprotein
Myprotein offers a 45g Lean Protein Bar alongside a separate Soft Protein Bar format.
- Myprotein UK lists 152 kcal and 18g protein per 45g Lean Protein Bar.
- Myprotein says the Lean bar is not suitable for vegetarians, that nutrition can vary by flavour and that excessive consumption may have a laxative effect.
Barebells
Barebells has both a 45g Hazelnut Spread bar and a 55g Cookies & Cream bar among the researched products.
- Tesco lists 167 kcal and 15g protein for the 45g Hazelnut Spread bar; Barebells UK lists 190 kcal and 20g protein for its 55g Cookies & Cream bar.
- The researched listings include allergen or cross-contact information and warnings about excessive consumption. Check the current wrapper for the flavour you choose.
Grenade
The researched Carb Killa examples are 60g bars for shoppers comparing a larger serving with smaller bars.
- ASDA lists 206 kcal and 22g protein for Caramel Chaos; Tesco lists 222 kcal and 21g protein for Chocolate Chip Salted Caramel.
- Those calorie figures are higher than the researched 45g Myprotein and Barebells examples. Read the flavour-specific allergen and sweetener information.
PhD
PhD describes full-size and half-size Smart Bar formats.
- PhD lists 21g protein and 238 calories for the featured full-size Smart Bar.
- Check the nutrition panel for the particular size and flavour rather than applying the full-size figure to a half-size bar.
Tesco
Tesco lists protein bars from several brands, including different sizes and pack formats.
- Its listings provide examples to compare by per-bar nutrition and ingredients.
- Tesco advises reading the physical product label because food information can change.
Protein bars on Joybuy
These Grenade and Nature Valley multipacks offer bars you can consider packing for a train journey. Compare the nutrition and ingredients for the individual bar before choosing between them.
No image available
Grenade Soft Core Double Chocolate Protein Bars, 12 x 50g
For a train snack, use the nutrition panel for one Double Chocolate bar to check its calories and protein. This is a pack of 12 x 50g bars; check the current wrapper for ingredients and allergens.
No image available
Grenade Soft Core Golden Caramel Protein Bars, 12 x 50g
Check the per-bar nutrition if Golden Caramel is a flavour you would pack for the journey. The multipack contains 12 x 50g bars; read the current ingredients and allergen information before eating.
No image available
Grenade Soft Core Peanut Butter Protein Bars, 12 x 50g
For this Peanut Butter option, check one bar’s calories, protein and full allergen statement before putting it in your travel bag. The pack contains 12 x 50g bars.
No image available
Grenade High Protein Low Sugar Oreo Flavour Bars, 4 x 60g
At 60g per bar, this is a different serving size from the 50g Soft Core options. Compare the complete bar’s calories and protein rather than choosing by its low-sugar product name; the pack contains 4 x 60g bars.
No image available
Nature Valley Protein Peanut & Chocolate Bars, 4 x 40g
These 40g bars offer another portion size to compare for a train snack. The pack contains 4 x 40g bars; check the current label for per-bar nutrition and peanut or other allergen information.
Questions about train snacks
How do I compare lower-calorie protein bars?
Compare kcal and protein for the complete bar you intend to eat; there is no single calorie figure that defines every lower-calorie choice. Myprotein UK lists 152 kcal and 18g protein for its 45g Lean Protein Bar, while Tesco lists 167 kcal and 15g protein for the 45g Barebells Hazelnut Spread bar. Check the current flavour’s wrapper before relying on either figure.
Should I choose the bar with the most protein?
Choose by protein and calories together, not protein alone. ASDA and Tesco list 21–22g protein and 206–222 kcal for the researched 60g Grenade bars, whereas Myprotein UK lists 18g protein and 152 kcal for its 45g Lean Protein Bar. Consider which complete serving fits your journey and what else you plan to eat.
Can one protein bar stand in for a meal on a long journey?
Do not assume a protein bar is a complete meal. Myprotein describes its Soft Protein Bar as a snack rather than a nutritionally complete meal, so plan other food if your journey crosses a usual mealtime.
What should I check on the wrapper before eating?
Read the current ingredients, allergen and ‘may contain’ statements for your particular bar. The researched product listings include differing milk, soy, nut and gluten-related information; the wrapper is especially important when an allergy affects your choice.
Why do some bars carry a laxative-effect warning?
Some of the researched Myprotein, Barebells and Grenade bars contain sweeteners or polyols and warn that excessive consumption may have a laxative effect. Read the pack guidance before taking several bars on a train journey, particularly if the product is unfamiliar to you.