How to Improve Your Gut Health

What Is Gut Health?

Your gut does more than digest food; it plays a central role in overall health by helping your body absorb nutrients, support immunity, manage inflammation, and maintain wellbeing.

"Gut health" describes how well your digestive system functions and the balance of bacteria and other microbes in your intestines, known as the gut microbiome. A balanced microbiome supports digestion, protects against harmful bacteria, and helps maintain the gut lining.

A healthy gut helps your body:

• Digest and absorb nutrients efficiently
• Keep your immune system strong
• Maintain regular bowel movements
• Support overall wellbeing

Eating a variety of plant foods and fibre helps keep your gut bacteria diverse and balanced.

Fibre isn't just bulk, it's fermented by gut bacteria to produce short-chain fatty acids (SCFAs), which help nourish the gut lining, reduce inflammation, and support metabolic health (Makki et al., 2018). A variety of plant-based fibres ensures a diverse microbiome, which is linked to better digestion and overall wellbeing.

How Your Gut Bacteria Help You

Gut bacteria perform several essential roles:

• Break down fibre: Producing SCFAs that nourish the gut lining and reduce inflammation (Makki et al., 2018).
• Support metabolism: SCFAs and other bacterial metabolites may help regulate energy balance and blood glucose levels.
• Protect against harmful bacteria: Beneficial microbes occupy space and nutrients, helping to prevent harmful bacteria from growing.

Maintaining a diverse microbiome is important for digestion, immunity, and overall health.

How to Improve Your Gut Health Through Diet

Fibre, Prebiotics and Probiotics

Your gut bacteria thrive on plant foods and fibres.

Fibre-rich foods support digestion, regular bowel movements, and feed beneficial gut bacteria:

• Whole grains: oats, brown rice, wholegrain bread, wholewheat pasta
• Fruit: berries, apples, pears, oranges
• Vegetables: broccoli, spinach, carrots, sweet potatoes
• Pulses: beans, lentils, chickpeas
• Nuts and seeds: almonds, chia seeds, flaxseeds

Adults should aim for around 30g of fibre per day from a variety of plant foods. Gradually increasing fibre intake helps prevent bloating or discomfort.

Prebiotics are specific types of fibre that particularly support beneficial bacteria. Good sources include:

• Onions, garlic, leeks, and asparagus
• Bananas and apples
• Oats and barley

Prebiotics selectively feed beneficial bacteria, promoting SCFA production and supporting gut barrier health.

Probiotics are foods containing live bacteria that can help maintain a balanced microbiome:

• Yoghurt with live cultures
• Kefir
• Sauerkraut, kimchi, and other naturally fermented vegetables
• Miso and tempeh

Probiotics introduce live bacteria that help maintain microbiome balance and support healthy gut function.

Practical tip: Aim to include a variety of plant foods daily and at least one serving of fermented food.

Limit Ultra-Processed Foods

Ultra-processed foods (UPFs) are often low in fibre and high in sugar and additives, which may reduce microbial diversity and contribute to inflammation.

Simple swaps:

• Choose sourdough or seeded bread instead of standard white sliced bread
• Snack on fresh fruit instead of packaged snacks
• Drink water or herbal tea instead of sugary drinks

Even small changes, such as replacing one ultra-processed snack each day with fruit can support gut health over time.

Lifestyle Habits That Support Gut Health

Stay Active

Regular physical activity supports gut microbial diversity. Moderate activities such as walking, cycling, swimming, or strength training are beneficial (Clarke et al., 2014).

Manage Stress

Stress can affect gut function. Mindfulness, yoga, breathing exercises, and hobbies can help support digestion and overall wellbeing.

Stay Hydrated

Fluids help fibre move through the digestive system, keeping stools soft and regular.

Adequate hydration also supports the fermentation process that produces SCFAs, enhancing fibre's benefits.

Aim for around 2–3 litres per day, including:

• Water
• Herbal teas
• Milk or unsweetened fortified soya alternatives

Eating for Gut Health – Quick Summary

• Eat a variety of plant foods daily
• Include at least one serving of fermented foods daily
• Limit ultra-processed foods
• Stay hydrated and physically active

Important Safety Note

This guide is for general information only. People with IBS, inflammatory bowel disease, or other digestive conditions should consult a GP, dietitian, or specialist before making dietary changes. Some high-fibre or fermented foods may trigger symptoms in sensitive individuals.

References

Makki, K., Deehan, E. C., Walter, J., & Bäckhed, F. (2018). The impact of dietary fiber on gut microbiota in host health and disease. Cell Host & Microbe, 23(6), 705–715. https://doi.org/10.1016/j.chom.2018.05.012

Clarke, S. F., Murphy, E. F., O'Sullivan, O., Lucey, A. J., Humphreys, M., Hogan, A., Hayes, P., O'Reilly, M., Jeffery, I. B., Wood-Martin, R., Kerins, D. M., Quigley, E., Ross, R. P., O'Toole, P. W., Molloy, M. G., Falvey, E., Shanahan, F., & Cotter, P. D. (2014). Exercise and associated dietary extremes impact on gut microbial diversity. Gut, 63(12), 1913–1920. https://doi.org/10.1136/gutjnl-2013-306541