3 / How to Rebuild a Healthier Gut After 45

By now, we have done two important things. We have stopped assuming that every digestive symptom after 45 is caused by menopause, and we have identified the most obvious places to start when bloating, constipation or reflux appears. Now we can go deeper and look at what actually helps build a digestive system that works well over the long term.

A healthier gut after 45 is not simply a gut that never bloats. It is a digestive system that moves food and waste effectively, maintains a healthy intestinal barrier, supports a diverse microbial ecosystem and allows you to eat a reasonably varied diet without constantly worrying about how your stomach will react. And despite the enormous gut-health industry, much of what supports this system is surprisingly straightforward.

Start by feeding your gut, not supplementing it

Your gut microbiome needs food. Many intestinal bacteria use carbohydrates that escape digestion in the small intestine, particularly different types of dietary fibre and resistant starch. Through fermentation, they produce metabolites called short-chain fatty acids, including acetate, propionate and butyrate.

Butyrate is particularly interesting because it is an important energy source for the cells lining the colon and is involved in maintaining normal intestinal barrier and immune function. This is one reason fibre matters far beyond simply helping you have a bowel movement.

There isn't, however, one magical fibre that feeds every beneficial bacterium. Different microorganisms use different substrates, so rather than becoming obsessed with one prebiotic powder or one "gut superfood," it makes more sense to think about the diversity of foods reaching your microbes.

Plant diversity matters more than finding the perfect gut food

Vegetables, fruit, legumes, whole grains, nuts, seeds, herbs and spices provide different fibres and an enormous range of plant compounds. A diet containing many of these foods therefore provides a broader range of substrates for the intestinal microbiome than eating the same few "healthy" foods every day.

You may have heard the recommendation to eat 30 different plants per week. This idea became popular after observational findings from the American Gut Project showed greater microbial diversity among people reporting more than 30 different plant foods each week compared with those eating fewer than 10. It is interesting research, but 30 is not a magic threshold that guarantees a healthy microbiome.

I prefer to use the number as inspiration rather than another target women have to achieve. Look at an average week and ask whether your plant intake has genuine variety. If you eat the same breakfast, salad and three vegetables almost every day, gradually widening that range is a perfectly sensible place to start.

Increase fibre according to the gut you actually have

Fibre recommendations for adult women are generally around 25 to 30 grams per day, depending on age and the guideline being used. But there is a big difference between where we would like your diet to end up and where your digestive system is comfortable starting.

If you currently eat very little fibre and are already significantly bloated, suddenly adding huge quantities of bran, beans, chia seeds and raw vegetables may leave you feeling considerably worse. Fermentation produces gas, and your digestive system may need time to adapt to a larger amount of fermentable material.

Increase fibre gradually instead. Add oats or seeds to breakfast, include legumes in manageable portions, choose whole grains more often, eat fruit with its skin where appropriate and gradually expand your vegetable intake. If constipation improves and bloating remains manageable, continue building.

If your abdomen becomes painfully distended after suddenly tripling your fibre intake, that does not mean fibre is bad for you. It may simply mean too much, too quickly, or it may tell us that another digestive problem needs addressing first.

Resistant starch gives your microbes something different to work with

Not all starch is completely digested in the small intestine. Resistant starch reaches the colon relatively intact, where bacteria can ferment it and produce short-chain fatty acids.

Sources include legumes, oats and green bananas, as well as some cooked and cooled starchy foods such as potatoes and rice. Cooling cooked starch can change part of its structure, making some of it more resistant to digestion.

You certainly don't need to spend your life eating cold potatoes to have a healthy microbiome. The useful point is that different whole foods provide different fermentable substrates. A varied diet naturally supplies many of them without requiring you to micromanage every gram of resistant starch.

Polyphenols belong in the gut conversation too

Fibre receives most of the attention, but plant foods also contain an enormous family of compounds called polyphenols. They are found in berries, cocoa, coffee, tea, extra virgin olive oil, herbs, spices, nuts and colourful fruit and vegetables.

Only some dietary polyphenols are absorbed in the small intestine. Others reach the colon, where gut microbes transform them into different metabolites. At the same time, polyphenols can influence the composition and activity of microbial populations. It is another example of the constant two-way interaction between our diet and the organisms living inside us.

This gives us yet another reason to eat a varied, colourful diet. Berries, herbs, walnuts, olive oil, tea, dark cocoa and vegetables already contain a remarkable amount of interesting chemistry. You don't necessarily need that chemistry extracted, powdered and sold back to you in a bottle.

Fermented foods can be useful, but they aren't compulsory

Yoghurt containing live cultures, kefir, sauerkraut, kimchi and other traditionally fermented foods contain microorganisms and compounds produced during fermentation. Research suggests that fermented foods can influence the gut microbiome and immune signalling, although exactly how much benefit an individual receives depends on the food, the microorganisms involved and the person eating it.

If you enjoy and tolerate fermented foods, they can be a useful part of a varied diet. Start with small amounts if they are new to you and see how your gut responds.

But fermented foods are not compulsory. Some women find that they aggravate bloating or other digestive symptoms. If kefir or sauerkraut makes you miserable, forcing yourself to eat it every day because you have been told it is essential for your microbiome makes very little sense.

Probiotics are not one universal gut treatment

This is one of the areas where marketing has greatly simplified the science.

Probiotics are not interchangeable. Evidence for probiotics is generally strain-specific and condition-specific, meaning a microorganism shown to be useful for one particular problem cannot automatically be assumed to help constipation, bloating, diarrhoea and IBS simply because all of those problems involve the gut.

The number of bacteria advertised on the front of the bottle is not a reliable measure of how useful the product will be either. Fifty billion organisms are not automatically better than ten billion, and a product containing fifteen different strains is not necessarily superior to one containing a carefully selected strain.

Before buying a probiotic, ask what you are actually trying to achieve and whether there is reasonable evidence for that particular strain or combination for that particular problem. If we cannot answer the first question, choosing the supplement becomes little more than guesswork.

Prebiotics and probiotics are not the same thing

Probiotics are live microorganisms. Prebiotics are substrates that are selectively used by microorganisms and provide a health benefit. Certain fermentable fibres and compounds such as inulin and fructooligosaccharides can act as prebiotics.

Prebiotic supplements can be useful in some circumstances, but because these compounds are fermented by intestinal bacteria, they can also produce substantial gas and bloating, particularly when introduced rapidly or in large amounts.

Before buying a prebiotic powder, remember that onions, garlic, leeks, asparagus, legumes, oats and many other ordinary foods already provide fermentable substrates. For most women, I would establish the food foundation first and use supplemental prebiotics when there is a clear reason rather than because every healthy gut supposedly needs one.

Your intestinal barrier needs nourishment, not a detox

The intestinal lining has the difficult job of allowing nutrients and other useful molecules to cross while maintaining an effective barrier between the contents of the intestine and the rest of the body. It is a dynamic tissue that is constantly being renewed.

Short-chain fatty acids produced by microbial fermentation, particularly butyrate, interact with the cells lining the colon and play a role in normal barrier function. Adequate protein provides amino acids required for tissue maintenance, while micronutrients including zinc and vitamins A and D contribute to normal epithelial and immune function.

Increased intestinal permeability is a genuine biological phenomenon and occurs in several medical conditions. What is much less convincing is the idea that virtually every woman with bloating, fatigue or brain fog has a "leaky gut" requiring months of detox powders and supplements.

Supporting the intestinal barrier starts with adequate nutrition, a functioning digestive system, appropriate microbial substrates and treatment of genuine gastrointestinal disease. It does not require detoxifying an intestine that is already equipped with sophisticated physiological systems of its own.

Digestive enzymes should solve a specific problem

Your body already produces digestive enzymes. The pancreas releases enzymes that help digest protein, fat and carbohydrate, while enzymes on the intestinal surface complete the digestion of particular nutrients.

There are situations where additional enzymes are genuinely useful. People with pancreatic exocrine insufficiency, for example, may require prescription pancreatic enzyme replacement. Lactase supplements can help people with lactose intolerance digest lactose.

But taking a broad digestive enzyme product with every meal does not automatically make a normally functioning digestive system work better. Before adding enzymes, ask what you are trying to compensate for. If there is no evidence that digestion of a particular nutrient is impaired, we may simply be adding another supplement without addressing the real problem.

Don't forget bile and fat digestion

Bile is produced by the liver and released into the small intestine, where bile acids help emulsify dietary fats so they can be efficiently digested and absorbed. Gallbladder function therefore matters to digestion, but again, symptoms need interpretation rather than self-diagnosis.

Persistent upper abdominal pain, particularly after eating, nausea, jaundice, pale stools or other significant changes require proper medical assessment. Gallstones and gallbladder disease become more common with age and are more common in women.

If fatty foods suddenly become extremely difficult to tolerate, the first step should not automatically be taking ox bile or a supplement marketed for "bile flow." The useful question is why has fat digestion apparently changed?

Your bowel needs movement as well as fibre

Supporting the microbiome while ignoring persistent constipation makes very little sense. If stool is moving slowly through the colon, adding large quantities of fermentable fibre and probiotics can sometimes increase discomfort rather than solve the underlying problem.

Regular physical activity can support bowel function, and walking is particularly underrated. It is accessible, reduces prolonged sitting, supports metabolic health and may help bowel regularity. A walk after meals also has the added advantage of supporting post-meal glucose regulation.

The digestive system does not exist independently from the rest of the body. The same habits that support metabolic and cardiovascular health often support gastrointestinal function too.

Sleep and stress affect the gut too

The gut continues to communicate with the brain regardless of how perfectly you eat. Through the gut-brain axis, psychological stress can influence intestinal motility, secretion and visceral sensitivity. Poor sleep can affect metabolic health, food choices, mood and the way we perceive physical discomfort.

This does not mean meditation cures gastrointestinal disease, nor does it mean persistent digestive symptoms should be dismissed as stress. It means that the nervous system is one part of gastrointestinal physiology and deserves consideration alongside food, motility, medications and disease.

A perfect diet cannot completely compensate for five hours of sleep, relentless stress and no recovery. Gut health is part of whole-body health, not a separate project taking place below your ribs.

Be very careful with elimination diets

Removing a food that repeatedly and reliably triggers symptoms can be extremely useful. Removing gluten, dairy, legumes, grains and half the vegetable aisle "just in case" is something entirely different.

Highly restrictive diets can reduce fibre and dietary diversity, make nutritional adequacy more difficult and create increasing anxiety around food. Ironically, they can also remove many of the substrates we are deliberately trying to provide to the microbiome.

The low-FODMAP diet is a good example. It has good evidence for reducing symptoms in many people with IBS, but the strict elimination phase is designed to be temporary. Foods are systematically reintroduced to identify which groups and quantities an individual can tolerate.

That last word matters: quantity. If half a cup of lentils causes no problem but an enormous bowl leaves you painfully bloated, the conclusion does not necessarily have to be "I cannot eat lentils." Dose matters, and the long-term goal should be the broadest nutritious diet you comfortably tolerate.

Stop trying to sterilise your microbiome

Another trend worth challenging is the idea that a healthy gut requires continually "killing bad bacteria." Antimicrobial herbs and compounds such as oregano oil and berberine have biological effects and may have legitimate uses in specific circumstances, but that does not make repeated antimicrobial protocols an appropriate response to unexplained bloating.

The intestine is an ecosystem, not a kitchen surface. We cannot look at every organism reported on a commercial stool test, confidently divide them into good and bad, and selectively eliminate the ones we dislike without affecting the wider microbial community.

Treating a diagnosed infection or another clearly identified condition is one thing. Repeatedly taking antimicrobials because you feel bloated is something very different. In most situations, supporting the ecosystem makes considerably more sense than declaring war on it.

How to build a healthier gut after 45: what actually works?

Once we strip away the marketing, the strategy becomes fairly straightforward. First, get digestion and elimination functioning as well as possible. Persistent constipation, significant reflux, chronic diarrhoea or another ongoing digestive problem needs to be addressed rather than buried underneath supplements.

Then gradually build a varied diet containing vegetables, fruit, legumes, whole grains, nuts, seeds, herbs and spices according to your individual tolerance. Provide different fibres, resistant starches and polyphenol-rich foods for the microbiome, and include fermented foods if they suit you. Keep moving, protect sleep and allow recovery because the digestive system remains connected to the rest of your physiology.

Only after those foundations are in place would I ask whether a particular probiotic, enzyme, prebiotic, supplement or therapeutic diet has a clear job to do. If it does, use it purposefully. If it doesn't, you probably don't need it.

What I want you to take away from this

A healthier gut is not created by endlessly removing foods or accumulating supplements. The long-term goal is a digestive system that functions well while allowing you to eat the broadest, most varied and nutritionally rich diet you comfortably tolerate.

Feed the ecosystem, support motility, gradually increase dietary diversity and correct genuine digestive problems. Use probiotics, enzymes, supplements and elimination diets when there is a specific reason for them, not simply because they appear on somebody's list of "gut health essentials." And if you do all of this but remain persistently bloated, constipated, uncomfortable or unable to tolerate foods, the answer may not be another gut protocol. It may be time to investigate.

Next: Gut Tests: What Is Actually Worth Checking?

You can explore more articles, free and paid resources, my book and programmes in the Gut & Digestion section of Feel Good Menopause.