Inside the digestive system lives a complex community of bacteria, fungi, viruses, and other microorganisms known as the gut microbiome. Many of these microbes help break down food, produce beneficial compounds, and protect the lining of the gut.
No single “superfood” can create a healthy microbiome. The strongest approach is to eat a varied diet containing fibre-rich plant foods and, where appropriate, foods with live bacterial cultures. When gut bacteria ferment certain types of fibre, they produce short-chain fatty acids that help nourish the cells lining the colon.
Here are eight practical foods that can help support healthy gut bacteria.
1. Plain Yoghurt and Amasi
Plain yoghurt containing live cultures can provide beneficial microorganisms. Check the label for terms such as “live cultures”, as some products are heat-treated after fermentation and may no longer contain living bacteria.
Amasi is another useful cultured dairy option. However, the types of cultures and the amount of added sugar differ between brands, so check the label. Choose plain, unsweetened products where possible and add fresh fruit for natural sweetness.
People with a milk allergy should avoid dairy, while those with lactose intolerance may need to test their individual tolerance or choose a suitable lactose-free product.
2. Oats
Oats contain soluble fibre, including beta-glucan. Some of this fibre is fermented by bacteria in the colon, producing compounds that support the gut lining.
Oats are affordable, filling, and easy to include in the diet. Enjoy them as porridge, blend them into a smoothie, or soak them overnight with plain yoghurt. Instant flavoured oats may contain considerable amounts of added sugar, so plain oats are usually the better everyday choice.
3. Beans, Lentils, and Split Peas
Beans, lentils, chickpeas, and split peas provide fibre and resistant starch. Resistant starch escapes complete digestion in the small intestine and reaches the colon, where gut bacteria can use it as fuel.
These foods also provide affordable plant-based protein and can be added to soups, stews, curries, and salads. If they cause wind or bloating, begin with a small portion and increase it gradually. Draining and rinsing canned beans may also improve tolerance.
4. Bananas
Bananas contain fibre, including pectin. Slightly green bananas also contain more resistant starch than fully ripe bananas, although bananas at every stage of ripeness can form part of a balanced diet.
They make a convenient snack and can be paired with oats, plain yoghurt, or unsweetened peanut butter. Whole bananas are preferable to banana-flavoured products, which may contain little fruit and plenty of added sugar.
5. Onions and Garlic
Onions and garlic contain fructans, a type of fermentable carbohydrate that certain gut bacteria can use. They are also an inexpensive way to add flavour to meals without relying heavily on salt or sugary sauces.
However, fructans may trigger pain, wind, or bloating in some people with irritable bowel syndrome. A food that supports one person’s microbiome may not suit another, so individual tolerance is important.
6. Whole Grains
Wholewheat bread, brown rice, sorghum or mabele, high-fibre cereals, and whole-grain maize products, where available, generally provide more fibre than highly refined alternatives.
Do not assume that brown or “multigrain” bread is made with whole grains. Check the ingredients list and choose bread that lists “wholewheat” or another whole grain as one of its first ingredients.
7. Colourful Vegetables
Vegetables provide fibre and plant compounds called polyphenols, some of which interact with gut microbes. Leafy greens, cabbage, carrots, tomatoes, pumpkin, beetroot, broccoli, and peppers all contribute different nutrients.
Aim to include different colours throughout the week. Frozen vegetables are nutritious, convenient, and may be more affordable than fresh produce when certain vegetables are out of season.
8. Apples
Apples contain pectin, a soluble fibre that can be fermented by bacteria in the colon. Much of an apple’s fibre is found in or close to the skin, so wash the fruit well and eat it unpeeled where practical.
A whole apple generally provides more fibre and is more filling than clear apple juice. Juice can also make it easier to consume large amounts of natural sugar without the same fibre.
Support Your Gut Gradually
Gut health depends on the overall eating pattern, not one food or supplement. Increase fibre gradually and drink enough water to reduce the likelihood of cramping, wind, or bloating. Persistent abdominal pain, blood in the stool, unexplained weight loss, ongoing diarrhoea, or a lasting change in bowel habits should be assessed by a doctor.
With the Affinity Health Day-to-Day Plan, members have access to unlimited 24/7 telephonic medical advice and nurse consultations, together with unlimited managed, in-network GP consultations via referral, making it easier to seek professional advice when persistent digestive symptoms need attention.
