How to Improve Your Gut Health After 60 — The Complete Guide

Your gut is far more important to your overall health than most people realise — and after 60 it requires more attention than ever. The gut microbiome — the trillions of bacteria, fungi, and other microorganisms living in your digestive system — influences everything from your immune system and mental health to your energy levels, weight, and risk of chronic disease. The good news is that gut health responds remarkably well to simple dietary and lifestyle changes at any age. Here’s everything you need to know.

Why Gut Health Changes After 60

Several factors cause gut health to decline with age:

Reduced microbial diversity The diversity of bacteria in your gut microbiome naturally decreases with age — reducing the resilience and functionality of your digestive system.

Slower gut motility The muscular contractions that move food through your digestive system slow with age — contributing to constipation and bloating that become increasingly common after 60.

Reduced stomach acid Stomach acid production decreases with age — affecting the breakdown of food and absorption of nutrients including vitamin B12, calcium, and iron.

Medications Many common medications taken by older Australians — particularly antibiotics, proton pump inhibitors for reflux, and pain medications — significantly affect the gut microbiome and digestive function.

Dietary changes Reduced appetite, changes in food preferences, and difficulties with food preparation can lead to less varied diets that don’t adequately support gut health.

Reduced physical activity Physical activity directly stimulates gut motility — less activity means slower digestion and increased constipation risk.

Why Your Gut Health Matters More Than You Think

Immune function Approximately 70 percent of your immune system is located in your gut. A healthy diverse gut microbiome is fundamental to effective immune function — protecting against infections, inflammation, and potentially cancer.

Mental health — the gut brain connection The gut and brain communicate constantly through what scientists call the gut brain axis. Your gut produces approximately 90 percent of your body’s serotonin — the neurotransmitter most associated with mood and wellbeing. Poor gut health is increasingly linked to depression, anxiety, and cognitive decline.

Nutrient absorption Your gut microbiome plays a critical role in extracting nutrients from food and producing essential vitamins including B12 and vitamin K. Poor gut health directly compromises nutritional status regardless of how well you eat.

Inflammation An unhealthy gut microbiome contributes to chronic low grade inflammation — a significant driver of virtually every major chronic disease including heart disease, type 2 diabetes, dementia, and cancer.

Weight management Gut bacteria directly influence how calories are extracted from food and how fat is stored — affecting weight management in ways that are increasingly well understood by researchers.

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Signs Your Gut Health May Need Attention

• Frequent bloating, gas, or abdominal discomfort
• Constipation or diarrhoea — or alternating between both
• Frequent heartburn or reflux
• Fatigue and low energy despite adequate sleep
• Food intolerances that have developed or worsened recently
• Frequent illness or slow recovery from infections
• Skin conditions including eczema or rosacea
• Low mood, anxiety, or brain fog

How to Improve Your Gut Health

1. Eat more fibre Dietary fibre is the primary fuel for your beneficial gut bacteria. Most Australians eat far less than the recommended 25 to 38 grams per day.

The best fibre sources for gut health:

• Legumes — lentils, chickpeas, beans — one of the most powerful gut health foods available
• Wholegrains — oats, barley, brown rice, wholemeal bread
• Vegetables — particularly onions, garlic, leeks, asparagus, and Jerusalem artichokes which contain prebiotic fibres that specifically feed beneficial bacteria
• Fruit — particularly berries, apples, and pears
• Nuts and seeds — particularly flaxseeds and chia seeds

Increase fibre gradually to avoid bloating and gas — your gut bacteria need time to adapt to increased fibre intake.

2. Eat fermented foods Fermented foods contain live beneficial bacteria — probiotics — that directly contribute to gut microbiome diversity.

The best fermented foods for gut health:

• Natural yoghurt with live cultures — look for “contains live cultures” on the label
• Kefir — a fermented milk drink with even higher probiotic content than yoghurt
• Sauerkraut — fermented cabbage, available in the refrigerated section of supermarkets
• Kimchi — Korean fermented vegetables
• Kombucha — fermented tea, widely available in Australian supermarkets
• Miso — fermented soybean paste, excellent in soups and dressings

Even small regular amounts of fermented foods produce measurable improvements in gut microbiome diversity.

3. Eat a diverse range of foods The diversity of your gut microbiome directly reflects the diversity of your diet. Research shows that people who eat 30 or more different plant foods per week have significantly more diverse gut microbiomes than those who eat fewer varieties.

This doesn’t require radical dietary changes — simply trying different vegetables, grains, and legumes each week adds meaningful diversity.

4. Stay hydrated Adequate water intake is essential for gut motility and preventing constipation. Aim for 6 to 8 glasses of water per day — more in hot weather or during physical activity.

5. Exercise regularly Physical activity directly stimulates gut motility — reducing constipation and supporting the movement of food through the digestive system. Even a 30 minute walk most days produces meaningful improvements in gut function.

6. Manage stress Chronic stress directly disrupts the gut microbiome and gut function through the gut brain axis. Stress management strategies — regular exercise, adequate sleep, mindfulness, and social connection — all support gut health indirectly through stress reduction.

7. Limit ultra processed foods Ultra processed foods — packaged snacks, fast food, commercial baked goods — are consistently associated with reduced gut microbiome diversity and increased gut inflammation. Minimising these foods and replacing them with whole foods produces rapid improvements in gut health markers.

8. Limit unnecessary antibiotics Antibiotics are sometimes necessary and life saving — but they also significantly disrupt the gut microbiome. Avoid requesting antibiotics for viral infections where they have no effect. When antibiotics are genuinely necessary support your gut microbiome during and after the course with probiotic rich fermented foods.

9. Consider a probiotic supplement Probiotic supplements provide concentrated doses of specific beneficial bacterial strains. The evidence for specific probiotic supplements varies — different strains have different effects and not all products contain what they claim.

If you want to try a probiotic supplement look for products with multiple strains, high colony forming unit counts, and evidence of viability through to the expiry date. Speak with your pharmacist or GP for specific recommendations.

10. Eat prebiotic foods Prebiotics are specific types of dietary fibre that selectively feed beneficial gut bacteria. The best prebiotic foods include garlic, onions, leeks, asparagus, bananas, oats, and flaxseeds. Including these foods regularly in your diet directly nourishes your beneficial gut bacteria.

Gut Health and Common Digestive Conditions

Constipation One of the most common digestive complaints in Australians over 60. Adequate fibre, hydration, and physical activity address the most common causes. Speak with your GP if constipation is persistent or severe — it can occasionally indicate more serious conditions.

Irritable Bowel Syndrome — IBS IBS affects a significant proportion of older Australians and is characterised by alternating constipation and diarrhoea, bloating, and abdominal pain. The low FODMAP diet — developed by Monash University in Melbourne — is the most evidence based dietary approach for IBS management. A dietitian can guide you through this approach safely.

Gastroesophageal Reflux Disease — GERD Reflux becomes more common after 60. Beyond medication management dietary approaches — smaller meals, avoiding trigger foods, not lying down within three hours of eating, and elevating the head of the bed — provide meaningful symptom relief for many people.

Diverticular Disease Diverticula — small pouches that form in the wall of the colon — are extremely common in Australians over 60. A high fibre diet is the primary preventive and management strategy for diverticular disease.

When to See Your Doctor

See your GP promptly if you experience:

• Blood in your stool
• Unexplained significant weight loss
• Persistent abdominal pain
• A significant change in bowel habits that lasts more than a few weeks
• Difficulty swallowing

These symptoms warrant investigation to rule out serious conditions.

Bowel cancer screening The National Bowel Cancer Screening Program provides free bowel cancer screening kits to all Australians aged 45 to 74. If you haven’t completed your screening test complete it — bowel cancer is highly treatable when detected early.

The Bottom Line

Your gut health is fundamental to your overall health, energy, immune function, and mental wellbeing — and it responds remarkably well to simple dietary and lifestyle changes at any age. More fibre, more fermented foods, more diverse plant foods, regular physical activity, and adequate hydration are the foundations of a healthy gut after 60.

Start with one change — add a serve of legumes to your diet this week, try a natural yoghurt with live cultures, or add a daily walk. Small consistent improvements compound into significant health benefits over time.