Top 10 Low Cal Protein Bars
Use this guide to compare ten popular low cal protein bars options for UK shoppers, with quick reasons to shortlist each one and a side-by-side look at the leading picks.
Editor’s quick picks
- Top pick:Smart Protein Bar
- Best value:Mix Variety Box
- Best for flavour range:Diet Protein Bar
Side-by-side comparison
| 🥇 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 |
Serving figures and supporting notes are based on published product information at the time of writing. Any value-for-money scores shown are editorial judgements, not customer ratings.
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