Why Diet Matters So Much

Chronic constipation is closely linked to the modern Western diet — low in fibre, high in processed food, and often not enough fluid. Compare that to traditional communities in parts of Africa and Asia where high-fibre diets are the norm — constipation, haemorrhoids, and diverticular disease are far less common there.

Your diet is not the only factor, but it is the one you have the most control over. Before trying laxatives or seeing a specialist, giving dietary change a genuine try for four to six weeks can resolve the problem for a large number of people. Understanding what different foods do to your bowel helps you make changes that actually stick.

Fibre: Two Types, Both Useful

Not all fibre works the same way. There are two main types, and both help your bowel — just in different ways.

Insoluble fibre does not dissolve in water. Think of it as roughage. It adds bulk to your stools, speeds things up through the colon, and keeps the bowel moving. Good sources include wheat bran, wholegrain breads and cereals, the skins of fruit and vegetables, nuts, and seeds. This is the type that really helps when your bowel is sluggish.

Soluble fibre dissolves in water and forms a soft gel that makes stools easier to pass and feeds the good bacteria in your gut. Good sources include oats, legumes (lentils, chickpeas, beans), fruits like apples, pears, and bananas, and vegetables like carrots and sweet potato. Psyllium husk — the active ingredient in Metamucil — is mainly soluble fibre and is one of the most well-studied fibre supplements for constipation.

Most Australians eat well under the recommended 25–30 g of fibre per day. The key is to increase your intake gradually — rather than all at once — to give your gut time to adjust without causing bloating and wind.

Best Foods to Include

  • Wholegrains: Oats, brown rice, wholemeal bread and pasta, barley, quinoa
  • Legumes: Lentils, chickpeas, kidney beans, black beans — among the highest-fibre foods available
  • Vegetables: Broccoli, Brussels sprouts, carrots, sweet potato, corn, peas — especially with skins on where applicable
  • Fruits: Pears, apples (with skin), kiwifruit, berries, prunes — kiwifruit in particular has good evidence for constipation relief
  • Prunes and prune juice: Contain sorbitol and chlorogenic acids, which have a natural laxative effect beyond their fibre content
  • Nuts and seeds: Almonds, flaxseeds (linseeds), chia seeds — also good sources of healthy fats
  • Bran cereal: Unprocessed wheat bran is one of the most concentrated sources of insoluble fibre

Hydration: The Factor People Often Miss

Fibre needs water to do its job. Without enough fluid, eating more fibre can actually make constipation worse — creating a dry, heavy mass in the colon instead of a soft, easy-to-pass stool. Your large bowel is very good at pulling water out of its contents, so if you are not drinking enough, even a high-fibre diet can leave you with hard stools.

Aim for at least 1.5–2 litres of water per day, and a little more if it is hot or you are exercising. Coffee and tea do contribute to your fluid intake, but they also have a mild dehydrating effect. Alcohol dehydrates and tends to make constipation worse over time, even if it causes an initial movement.

One simple habit that can really help: drink a large glass of water first thing in the morning before breakfast. This helps trigger the gastrocolic reflex — the natural bowel contraction that your body uses to want to go to the toilet in the morning. A warm drink at breakfast makes this effect even stronger.

A Sample High-Fibre Day of Eating

What a bowel-friendly day might look like

  • Breakfast: Large bowl of oats with sliced banana, chia seeds, and a handful of berries — glass of water first thing
  • Morning tea: Apple (with skin) and a small handful of almonds
  • Lunch: Wholegrain wrap with hummus, roasted vegetables, and lentil salad
  • Afternoon tea: Kiwifruit or a small serve of prunes
  • Dinner: Grilled fish or chicken with brown rice, broccoli, and sweet potato (skin on)
  • Through the day: At least 8 glasses of water; herbal teas count
  • Total fibre: Approximately 30–35 g — well within the target range

Foods That Can Make Constipation Worse

Some foods slow the bowel down or take the place of higher-fibre options. It is worth keeping an eye on how much of these you are eating:

  • Processed and fast foods: White bread, pastries, chips, and takeaway are typically very low in fibre and high in fat, which slows down how quickly your stomach empties
  • Red meat and processed meats: High in fat and protein but low in fibre — in large amounts, these can slow things down
  • Too much dairy: Cheese in particular tends to be constipating for many people because it is high in fat and has no fibre
  • Unripe bananas: These contain a type of starch (resistant starch) that can slow the bowel. Ripe bananas are actually helpful — it is the green, firm ones to watch out for
  • Alcohol: Dehydrates your body and disrupts the normal rhythm of your gut

You do not need to cut these out completely — the aim is to make sure your overall eating pattern has plenty of fibre and fluid rather than to avoid any particular food.

The Role of Probiotics

Your gut microbiome — the community of billions of bacteria living in your large intestine — has a real effect on how regularly your bowels move. Certain bacteria produce substances that keep the bowel moving, and a healthy, diverse gut microbiome is linked to better bowel regularity.

Foods naturally rich in probiotics (live beneficial bacteria) include yoghurt with live cultures, kefir (a fermented milk drink), sauerkraut, kimchi, miso, and tempeh. Probiotic supplements containing strains like Lactobacillus acidophilus, Bifidobacterium longum, and Bifidobacterium lactis may help with constipation symptoms for some people — though the effect varies from person to person.

Prebiotics are foods that feed the good bacteria already living in your gut — think garlic, onion, leeks, asparagus, oats, and bananas. Including these regularly supports a healthy gut microbiome in a natural, affordable way.

When to Use Laxatives and Supplements

Dietary and lifestyle changes typically take two to four weeks before you notice a real improvement. While you are waiting for that to kick in — or if your constipation is more severe — laxatives can give you some relief.

Fibre supplements (Metamucil, Benefibre, Normafibe) are a great first step when your diet does not have enough fibre. Always take them with a full glass of water. Psyllium has the strongest evidence behind it and actually helps with both constipation and loose stools by normalising stool consistency.

Osmotic laxatives (Movicol, Osmolax, lactulose) work by drawing water into the bowel to soften the stool. They are gentle and well-tolerated, safe for regular use under medical supervision, and particularly helpful for older people or those taking medications that cause constipation.

Stimulant laxatives (senna, bisacodyl) work faster by directly stimulating the bowel to contract. They are good for short-term relief but are generally not recommended for daily long-term use without guidance from your doctor.

Frequently Asked Questions

How much fibre do I actually need?

Australian guidelines recommend 25 g of fibre per day for women and 30 g for men. Most of us manage only 20–22 g. To avoid bloating, increase your intake gradually — about 3–5 g more per week. To give you an idea: half a cup of cooked lentils gives you about 8 g, an apple with its skin gives about 4 g, and a bowl of oats gives about 4 g.

Will eating more fibre make me bloated?

Possibly at first. As your gut bacteria adjust to more fibre coming through, some people get extra wind and bloating for the first two to four weeks. Going gradually and drinking plenty of water helps a lot. Soluble fibre (like psyllium) tends to cause less gas than insoluble fibre like wheat bran.

Is coffee helpful or harmful for constipation?

For many people, coffee — caffeinated or even decaffeinated — triggers the urge to go within minutes. This is partly down to the gastrocolic reflex (the natural bowel contraction that happens after eating or drinking). Coffee does have a mild dehydrating effect, so it should not replace your water intake. Overall, moderate coffee consumption is neutral to mildly helpful for most people with constipation.

Are fibre supplements as good as eating high-fibre foods?

Whole foods are better overall because they also deliver vitamins, minerals, and a variety of fibre types that supplements cannot fully match. But fibre supplements are a practical and evidence-based option when changing your diet is not easy enough on its own — especially when travelling or when food choices are limited.

Should I try a low-FODMAP diet for constipation?

The low-FODMAP diet was designed mainly for people whose IBS causes diarrhoea, bloating, and pain — not primarily constipation. Some low-FODMAP foods are actually low in fibre, which could make your constipation worse. If you think IBS might be involved in your symptoms, talk to your doctor or a dietitian before trying this approach.

How long do dietary changes take to work?

Most people notice their stools becoming softer and easier to pass within one to two weeks of genuinely increasing fibre and fluid. A consistent improvement in how often you go may take two to four weeks. It is worth sticking with it — many people give up too soon, before the changes have had enough time to make a difference.

Still struggling even after changing your diet?

If you have genuinely tried dietary changes for several weeks and constipation is still a problem, it is worth getting checked. Mr Ba Nguyen can assess whether something structural or functional is going on that needs further investigation. Call (03) 9816 3951 or contact us at admin@northeasternsurgical.com.au.