If you've ever tried to find a protein powder that also delivers meaningful fibre, you'll know how short the search is. Most protein powders contain little to no fibre. Some contain a gram or two, often from an added fibre ingredient rather than anything inherent to the protein source. Finding a protein powder with 8–10g of fibre per serving from whole-food ingredients is uncommon.
This isn't an oversight. It's largely a consequence of how protein powders are made. Understanding why fibre is reduced in many protein products explains a lot about the supplement industry — and about what makes the products that retain it fundamentally different.
The Isolation Problem
The vast majority of protein powders — whey, pea, rice, soy, hemp isolates and concentrates — are made through a process often referred to as protein isolation or concentration. The goal is to extract and concentrate protein from a whole-food source while reducing much of the rest.
For whey, that means separating milk into its component parts, filtering out much of the lactose and fat, and concentrating the remaining protein. For pea, it means extracting the protein fraction from dried peas using water and sometimes chemical processing, reducing the starch, fibre, and other components. For soy, it involves aqueous or solvent extraction followed by precipitation and drying.
In each case, the process is designed to increase protein concentration. A whey protein isolate is typically 80–90% protein by weight. A pea protein isolate is similar. The numbers on the label look high because the manufacturing process is designed to prioritise protein content.
But concentration comes with trade-offs. As protein is concentrated, fibre and other components from the original food are reduced. The fibre doesn't disappear by accident — it is largely removed as part of increasing protein density.
What Gets Lost
Consider whey protein. Milk contains no fibre (it's an animal product), so whey was never going to deliver fibre regardless of processing. But many plant protein sources do start with meaningful fibre content.
Yellow peas contain approximately 25g of fibre per 100g in their whole form. By the time they've been processed into pea protein isolate, that fibre content drops to very low levels. The isolation process removes the fibre-rich structures, retaining primarily the protein fraction.
Brown rice contains about 3.5g of fibre per 100g. Rice protein concentrate retains relatively little of it. Hemp seeds contain roughly 4g of fibre per 30g serving in whole form. Hemp protein powder retains some, but typically less than the original seed.
The pattern is consistent: the more a protein source is processed to increase protein concentration, the less fibre remains. Isolation and fibre retention tend to work in opposite directions.
Why Brands Don't Fix This
If fibre is valuable and consumers want it, why don't protein brands simply add fibre back into their products?
Some do. A handful of protein powders include supplemental fibre — typically inulin, psyllium husk, or chicory root fibre — added as a separate ingredient. This allows the label to show a fibre value, but there are meaningful differences between added fibre supplements and fibre naturally present in whole foods.
Added fibre is typically a single, isolated compound. Intrinsic fibre is part of a more complex food structure that includes protein, fat, micronutrients, and other compounds. The way your body processes these can differ. Whole-food fibre arrives embedded in the structure of the food, alongside other nutrients. Supplemental fibre is added separately and, in some cases, may cause digestive discomfort in larger amounts for some individuals.
There's also a practical challenge. Adding fibre to a protein isolate changes the texture, mixability, and taste of the product. Fibre absorbs water, which can make the shake thicker or less smooth. It can interfere with the formulation and require additional ingredients to stabilise the texture.
Many brands prioritise protein content, taste profile, and mixability, which can make higher fibre inclusion less straightforward.
The Numbers In Context
The recommended daily intake of dietary fibre in the UK is 30g per day. The average UK adult consumes approximately 18g — a gap of around 12g that has remained consistent for years.
If you consume a protein shake daily and it contains no fibre, that shake is contributing protein but not helping to close that fibre gap.
Now consider the same scenario with a shake that delivers 8–10g of fibre per serving. That single daily habit can contribute a meaningful portion of your recommended intake. Over time, that contribution adds up.
Research published in The Lancet, reviewing 185 prospective studies, found that higher fibre intake is associated with a lower risk of several chronic conditions, including heart disease, stroke, type 2 diabetes, and colorectal cancer. These associations relate to overall dietary patterns and consistent intake over time.
How Protein & Fibre Is Different
Protein & Fibre takes a different approach to the protein-fibre relationship. Instead of isolating protein and then adding components back in, it starts with a whole food and retains more of its original composition.
The base ingredient is ground sunflower kernels — hulled, cold-pressed to reduce excess oil, pasteurised for food safety, and finely ground. The protein, fibre, healthy fats, and naturally occurring micronutrients remain together in their original food matrix because the manufacturing process does not separate them into isolated fractions.
Each 50g serving delivers 21–23g of protein alongside 8–10g of dietary fibre — not because fibre was added separately, but because the sunflower kernel naturally contains both.
This has a few practical implications:
The fibre is intrinsic to the food rather than added as a supplement. It remains part of the kernel's structure and contributes to digestion in the context of a whole-food ingredient.
The protein and fibre are consumed together, which may influence digestion rate and satiety compared to isolated protein alone.
The ingredient list remains short, without the need for added fibre ingredients or additional formulation to compensate for their inclusion.
What To Look For On The Label
If you're searching for a genuinely high-fibre protein powder, here's what to check.
Look at the fibre content per serving. A meaningful amount is typically 5g or more. Anything under 2g is relatively low. Protein & Fibre delivers 8–10g per serving.
Check where the fibre comes from. If fibre appears as a separate ingredient (inulin, chicory root fibre, psyllium husk, acacia fibre), it's been added after processing. If it comes from the same whole-food ingredient that provides the protein, it's intrinsic.
Consider the overall composition. A product with protein, fibre, and naturally occurring micronutrients from a whole-food source is nutritionally different from one that provides protein alone with added ingredients to adjust taste and texture.
The Search Gap
The reason you're reading this article is likely because you searched for something like "high fibre protein powder" or "protein powder with fibre." The relatively limited number of options available reflects how most products are formulated.
Many protein powders are designed around protein concentration, flavour, and convenience. Fibre is not always prioritised, partly because the manufacturing process reduces it early on.
Protein & Fibre sits in a different category. It's not a protein isolate with fibre added back in. It's a whole-food product that retains its fibre from the start.
If fibre is something you're actively trying to increase in your diet, choosing a protein powder that contributes to that goal can make a practical difference over time.
Frequently Asked Questions
Why don't most protein powders contain fibre?
Because protein isolation processes reduce fibre (along with fats, minerals, and other components) to increase protein concentration per gram. For plant proteins, fibre-rich parts of the original food are reduced during extraction. For whey, the source contains no fibre to begin with.
How much fibre is in Protein & Fibre?
Each 50g serving contains 8–10g of dietary fibre from whole ground sunflower kernels. This contributes a meaningful portion of the UK recommended daily intake of 30g.
Is added fibre as good as whole-food fibre?
There are differences. Whole-food fibre is part of a broader food structure that includes other nutrients, while supplemental fibre is isolated. Both can contribute to total intake, but they may behave differently in digestion.
Can I just take a fibre supplement alongside my protein shake?
You can. That would increase your fibre intake, though it involves combining separate products. Some people also find higher doses of supplemental fibre less comfortable than fibre from whole foods.
What other nutrients come alongside the fibre in Protein & Fibre?
Because the fibre comes from whole sunflower kernels, it is accompanied by protein, fats, and naturally occurring micronutrients including iron, potassium, calcium, and vitamin E.
How does 8–10g of fibre per serving compare to whole foods?
For context: a medium apple contains about 4g of fibre. A portion of broccoli contains about 3g. A slice of wholemeal bread contains about 2g. At 8–10g per serving, this represents a relatively high fibre contribution compared to many individual foods.