Gut health has become one of the biggest food trends in the UK, but the supermarket aisle can make it look expensive.
Shots, powders, specialist cereals, fortified snacks and premium fermented products increasingly use gut-health language. Some may be useful, but eating in a way that supports digestive health does not have to begin with a £4 bottle or a subscription.
For most people, the basics are much less glamorous: eat enough fibre, include a good variety of plant foods, drink enough fluid and build meals around foods you can afford to buy regularly.
The NHS recommends that adults aim for around 30g of fibre a day. Most people in the UK do not reach that level, which is one reason fibre has become such a prominent food trend.
NielsenIQ reported in 2026 that sales of fibre-based foods were growing strongly in UK supermarkets. That commercial interest is useful, but it is worth remembering that many naturally high-fibre foods are among the cheapest ingredients in the shop.
Here are 15 affordable foods that can make a higher-fibre, more varied diet easier without relying on expensive wellness products.
1. Oats
Oats are one of the easiest high-fibre staples to use regularly.
Porridge is the obvious option, but oats can also be added to yoghurt, overnight oats, homemade muffins and savoury dishes.
Own-brand oats are usually inexpensive and have a long shelf life, which makes them useful when trying to reduce food waste.
Adding fruit or seeds can increase the variety of plant foods in the meal without making breakfast complicated.
2. Lentils
Dried lentils are among the best-value ingredients in a supermarket.
They work in soups, curries, stews, pasta sauces and salads. Red lentils cook quickly and break down into sauces, while green or brown lentils keep more texture.
Tinned lentils cost more per portion than dried, but they are convenient and still useful when time matters.
They provide fibre and plant protein, making them particularly good for stretching meals that would otherwise depend heavily on meat.
3. Chickpeas
Chickpeas are another low-cost cupboard staple.
Use them in curries, salads, soups, hummus or traybakes. They can also be roasted for a snack.
Tinned chickpeas require almost no preparation. Dried chickpeas are cheaper but need soaking and cooking.
Either format can help increase both fibre and plant-food variety.
4. Beans
Kidney beans, butter beans, cannellini beans, black beans and other pulses are worth keeping in rotation rather than relying on one type.
They can bulk out chilli, pasta sauce, casseroles and soups.
Baked beans can also contribute fibre, although salt and sugar levels vary between products, so compare labels if they are a regular part of your diet.
Switching between different beans is an easy way to add variety without learning completely new recipes.
5. Potatoes with their skins
Potatoes are sometimes overlooked in conversations about healthy eating because they are familiar and inexpensive.
Keeping the skin on where appropriate increases the fibre content.
Baked potatoes can also become a complete meal with toppings such as beans, tuna, cottage cheese, leftover vegetables or chilli.
They are cheap, filling and easy to combine with other high-fibre foods.
6. Wholemeal bread
Replacing some white bread with wholemeal or higher-fibre bread is one of the simplest everyday changes.
You do not need a specialist loaf carrying a digestive-health claim.
Check the nutrition label and compare fibre between products. Own-brand wholemeal bread can be inexpensive and works for toast, sandwiches and simple meals.
If changing suddenly causes digestive discomfort, increasing fibre gradually may be easier.
7. Wholewheat pasta
Pasta is already a staple in many households, so changing the type can increase fibre without changing the meal itself.
Wholewheat pasta works with the same tomato sauces, vegetables, meat, fish or pulses you would normally use.
Another useful approach is to mix wholewheat and standard pasta while adjusting to the flavour and texture.
8. Frozen peas
Frozen vegetables are often better value than people assume.
Peas contain fibre and can be added straight from the freezer to pasta, rice dishes, soups, curries and casseroles.
They also help solve a common problem with fresh vegetables: buying them with good intentions and throwing them away at the end of the week.
Frozen produce can make healthy eating more reliable because it is available when you need it.
9. Frozen mixed vegetables
The same principle applies to mixed vegetables.
A basic frozen bag can add several different plants to a meal in minutes.
Use them in stir-fries, soups, fried rice, pasta, curries or alongside a main dish.
They may not have the visual appeal of a premium fresh produce display, but nutritionally they can be a practical part of a balanced diet.
10. Apples and pears
Fruit does not need to be exotic to be useful.
Apples and pears are easy to carry, require almost no preparation and provide fibre, particularly when eaten with the skin.
Buying loose fruit can help control both cost and waste because you can choose exactly how many pieces you need.
In autumn, British-grown apples and pears may also be widely available.
11. Carrots
Carrots are inexpensive, versatile and keep relatively well.
They can be eaten raw, roasted, grated into salads, added to sauces or cooked into soups and stews.
Using the same ingredient in several different ways makes it easier to finish the bag before it spoils.
12. Cabbage
Cabbage is one of the most underrated value vegetables.
A single cabbage can provide several meals and can be used raw in slaw, cooked into stir-fries, added to soups or served as a side dish.
Red, white and savoy cabbage each offer different textures and flavours.
For anyone trying to eat a wider variety of plants without buying lots of individual vegetables, cabbage is a useful foundation.
13. Onions
Onions are not usually marketed as a health food, but that is part of the point.
A better diet is often built from ordinary ingredients.
Onions appear in countless soups, sauces, curries, stews and traybakes, making them an easy way to add another plant ingredient without changing the character of a meal.
They are also relatively inexpensive and store well.
14. Plain yoghurt with live cultures
Yoghurt can be part of a varied diet and some products contain live cultures.
Check the label rather than assuming every yoghurt marketed around gut health contains the same cultures or provides the same nutritional profile.
Plain yoghurt can be cheaper than heavily branded specialist products and can be combined with oats, fruit and seeds for a simple breakfast or snack.
If you do not eat dairy, compare plant-based alternatives carefully because protein, sugar and fortification vary considerably.
15. Nuts and seeds in small amounts
Nuts and seeds can look expensive when you compare the price of a full bag, but portions are generally small.
A spoonful of seeds added to porridge or yoghurt can increase fibre and variety without requiring a large serving.
Buying supermarket own-brand versions or larger bags may reduce the cost per portion.
People with allergies should obviously avoid the relevant products, and whole nuts are not suitable for very young children because of choking risk.
Do you need expensive gut-health products?
Not necessarily.
There is a growing market for products making claims around fibre, prebiotics, probiotics and digestive wellness.
Some are convenient and some may fit well into a person's diet. But price and branding are not reliable measures of whether a food is useful.
A basic bowl containing oats, yoghurt and fruit can bring together fibre, plant variety and a fermented dairy product for a fraction of the price of many specialist breakfasts.
Likewise, a lentil and vegetable soup may be more relevant to an overall healthy eating pattern than an expensive shot consumed alongside a low-fibre diet.
The bigger picture matters more than one product.
Increase fibre gradually
Going from a low-fibre diet to a very high-fibre diet overnight can cause bloating or digestive discomfort.
The NHS advises increasing fibre intake and drinking enough fluid.
A practical approach is to make one or two changes at a time: switch breakfast cereal, add beans to one meal, use wholemeal bread or add an extra vegetable.
Consistency is more useful than trying to hit a perfect target in one day and giving up the next.
Variety matters too
Fibre is not one single substance, and different plant foods contain different types.
That is another reason to rotate foods rather than eating the same high-fibre cereal every day and assuming the job is done.
A week that includes oats, beans, lentils, wholegrains, fruit and several vegetables naturally creates more variety.
You do not need to count every different plant unless you find that motivating.
Think of variety as a direction rather than another number to obsess over.
How to keep the cost down
The cheapest healthy food is not helpful if it ends up in the bin.
Use frozen vegetables when fresh produce is often wasted. Buy tinned beans for convenience and dried pulses when cost matters more than preparation time. Choose own-brand wholegrains and compare price per kilogram rather than front-of-pack marketing.
Plan several meals around the same ingredients.
A bag of carrots might become soup, a side dish and part of a pasta sauce. Lentils can be used in curry one night and added to a tomato sauce later in the week.
That is usually more economical than buying a different set of 'healthy' ingredients for every recipe.
The useful gut-health shopping list is surprisingly ordinary
If you stripped away the wellness branding, a gut-friendly shopping basket could look extremely familiar:
oats, wholemeal bread, potatoes, beans, lentils, chickpeas, frozen vegetables, carrots, cabbage, onions, apples, pears and plain yoghurt.
That is good news.
Healthy eating becomes much easier to sustain when it is built around ordinary food that fits the household budget.
The goal is not to find one product that fixes your gut.
It is to make fibre, variety and balanced meals normal enough that they happen most days without requiring much thought.
This article provides general healthy-eating information and is not medical advice. People with digestive conditions, allergies or other specific dietary requirements should follow appropriate professional advice.
REFERENCES
1. NHS, How to get more fibre into your diet: https://www.nhs.uk/live-well/eat-well/digestive-health/how-to-get-more-fibre-into-your-diet/
2. NHS, Good foods to help your digestion: https://www.nhs.uk/live-well/eat-well/digestive-health/good-foods-to-help-your-digestion/
3. NHS, Eating a balanced diet: https://www.nhs.uk/live-well/eat-well/how-to-eat-a-balanced-diet/eating-a-balanced-diet/
4. NielsenIQ, UK shoppers shift to healthier diets in 2026: https://nielseniq.com/global/en/news-center/2026/uk-shoppers-shift-to-healthier-diets-in-2026-fuelling-growth-in-protein-and-fibre-sales/
