Protein Bars: Healthy or Unhealthy? | Expert Review (2026)

Are protein bars a healthy snack option, or are they hiding a dark secret? Let's dive into this controversial topic and uncover the truth!

Protein bars have become a staple in British supermarkets, with brands like Grenade, Trek, and Fulfil promising a boost of health and energy. But here's where it gets tricky: these bars are not all created equal, and some experts are raising red flags.

The protein bar industry is booming, valued at over £1.3 billion, but a growing number of professionals are warning about their potential drawbacks. TV fitness guru Joe Wicks even released a documentary titled "Licensed To Kill," accusing protein bar companies of packing their products with sugar, fat, and ultra-processed ingredients. And research seems to support these claims.

A study from Queen Mary University of London found that many snack bars, including protein bars, are high in sugar and saturated fat. The researchers concluded that customers are being misled about the healthiness of these products.

So, are all protein bars unhealthy? Not necessarily, say experts. While natural protein-rich snacks like seeds, nuts, eggs, and yogurt are generally considered better, some bars are more nutritious than others.

Let's take a look at some of the healthiest and unhealthiest protein bars on the market, according to nutritionist Pippa Campbell, author of "Eat Right, Lose Weight."

The Healthiest Protein Bars

Fulfil Chocolate Salted Caramel Vitamin & Protein Bar

£2.90 for a 55-gram bar at tesco.com

This bar is low in sugar and high in protein, making it one of the healthier options. It's enriched with nine vitamins, including folic acid, vitamins E and C, and four types of vitamin B. While it has slightly more calories due to its high protein content, it's still a good choice. Ms. Campbell was impressed by its low sugar content and high protein levels, but she did note that it's relatively low in fiber.

Fast 800 Dark Chocolate Raspberry Protein Bar

£26.99 for 12 x 45-gram bars at thefast800.com

This raspberry-flavored bar is high in protein and fiber, with 14 grams of protein and 9 grams of fiber. The protein and fiber come from peanut paste and chicory root fiber, which are not considered ultra-processed. It has a low sugar content of just 1 gram, but it does contain more fat than other bars. Ms. Campbell points out that it's not entirely free of ultra-processed ingredients, as it contains added sweeteners and soy protein isolate.

The Protein Ball Co Blueberry Oat Muffin

£1.85 for a 45-gram bag at healthysupplies.co.uk

Protein balls are becoming popular, and this brand is considered one of the healthiest options. The blueberry oat muffin flavor is made with natural ingredients like dates, almonds, freeze-dried blueberries, gluten-free oats, and flax seeds. It's also enriched with vitamins B12, C, and D. While it's lower in protein and fiber, the sugar and fat come from natural sources like dates, making it a preferable option for those avoiding ultra-processed products.

Deliciously Ella Roasted Peanut Protein Ball

£1.90 for a 40-gram ball at Waitrose.com

Another natural protein ball, this product is made with dates, peanuts, and peanut butter. It's low in calories and fat but also lower in protein and fiber. The sugar content is high due to the dates, but Ms. Campbell prefers this option over bars with less sugar but more ultra-processed ingredients. She highlights that the fiber, sugar, and fats come from whole food ingredients, lacking artificial sweeteners and refined oils.

Pip & Nut Dark Chocolate Peanut Protein Bar

£4 for 3 x 46-gram bars at tesco.com

This bar is based on natural ingredients and is relatively high in protein and low in sugar. It contains peanuts, dark chocolate, and oats, providing a good source of protein and fiber. However, it's higher in calories and fat, and it's not entirely free of ultra-processed ingredients. Ms. Campbell notes that it uses agave syrup, which is more refined than people realize.

The Unhealthiest Protein Bars

Trek Power Lotus Biscoff Bar

£2.29 for a 55-gram bar at proteinpackage.co.uk

This bar is high in calories, fat, and sugar, and it's filled with ultra-processed ingredients. The Lotus Biscoff flavor is based on a sugary biscuit snack, and it contains candied sugar syrups, flavorings, and refined vegetable oils. While it has a respectable amount of protein and fiber, Ms. Campbell categorizes it as highly processed due to its ingredient list.

Grenade Oreo White Protein Bar

£2.70 for a 60-gram bar at tesco.com

Grenade is a popular brand, but experts have concerns about its products. This Oreo White Protein bar is low in sugar, but it's also low in fiber and protein. Ms. Campbell highlights that its low sugar content is due to the use of sucralose, an artificial sweetener. She also points to flavorings and refined vegetable oils, making it a highly ultra-processed option.

So, there you have it! Protein bars can be a healthy choice, but it's important to read the labels and choose wisely. What are your thoughts on protein bars? Do you have a favorite brand or flavor? Feel free to share your opinions and experiences in the comments below!

Protein Bars: Healthy or Unhealthy? | Expert Review (2026)
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