Top 10 Low‑Calorie Protein Bars in the UK
Discover popular low‑calorie protein bars from PhD, Fulfil, Huel and more. Compare protein, sugar and flavours to find your ideal bar.
- ✅ Updated September 2025
- 🏆 Best‑Selling
- 📝 Editorial Reviews & Comparisons
Smart Protein Bar
Diet Protein Bar
Whipped Protein Bar
Vitamin & Protein Bar
Complete Nutrition Bar
Vitamin & Protein Bar
Top Low‑Calorie Bars (Compared Side by Side)
| 🥇 PhD Smart Bar | 🥈 Yubi Mix Variety Box | 🥉 Applied Nutrition Diet Bar | |
|---|---|---|---|
| Protein (g) | 22 g | 10 g | 12 g |
| Calories | 246 kcal | 99 kcal | 138 kcal |
| Protein Type | Milk Blend | Plant‑Based | Protein Blend |
| Sugar Level | Low | Low | Low |
| Carbs Level | Medium | Low | Low |
| Fat Level | Medium | Low | Medium |
| Fibre Level | Medium | High | Medium |
| Servings | 12 | 12 | 12 |
| Extras | Multi‑layered bar | Variety mix (4 flavours) | Added vitamins |
| Value for money | 3.7/5 | Best Value 3.8/5 | 3.6/5 |
| Overall | Good | Good | Good |
| Best for | High protein treat | Variety mix | Vitamin boost |
| View Product → | View Product → | View Product → |
For general comparison purposes, amounts and servings are approximate and taken from product labels. All “Value for Money” scores are editorial ratings based on the author’s independent assessment. Macro levels (Low/Medium/High) are simplified for ease of comparison. Information is for general purposes only.
FAQs
Do low‑calorie protein bars really help with weight loss?
Many people choose low‑calorie bars as convenient snacks to help manage hunger. However, they should be eaten as part of a balanced diet and not relied upon as a sole weight‑loss solution.
How much protein should a low‑cal bar have?
Protein content typically ranges from 10–20 g per bar. Consider your overall protein needs and check the label for both protein and calorie counts.
Are low‑calorie bars high in sugar alcohols?
Some bars use sugar alcohols or fibre syrups to keep sugars low. If you’re sensitive to these ingredients, read the ingredient list and opt for bars with simpler formulations.
Can a protein bar replace a meal?
Protein bars are best viewed as snacks. For a balanced meal, consider a meal replacement shake or whole foods that provide protein, carbohydrates, fats and micronutrients.
Not sure a bar will fill you up? Explore our favourite meal replacement shakes for a more complete option.
See Top 10 Meal Shakes →