Constipation Is Not Just About Fibre: Why Gut Motility Matters

Constipation is often caused by a number of factors that affect how well your digestive system moves and functions.

If you’re struggling with constipation, one of the first things you’ve probably been told is to eat more fibre.

And while fibre can be incredibly helpful, it isn’t always the right place to start.

In clinic, I often see people who are eating plenty of vegetables, seeds, and whole grains, yet they’re still experiencing infrequent bowel motions, bloating, and a persistent feeling of heaviness. In some cases, increasing fibre further can actually make symptoms worse.

The reason? Constipation is about more than what you eat. It’s also about how well your digestive system moves. As with many aspects of health, digestion does not operate in isolation. Gut function influences everything from energy and mood to skin, immunity, and hormonal balance. My previous blog post explores why gut health is the foundation of overall wellness.

What Is Gut Motility?

Gut motility refers to the coordinated contractions that move food through the digestive tract.

This process begins as soon as you eat and continues all the way through to elimination. When motility slows, waste remains in the colon for longer than it should, allowing more water to be absorbed and stools to become hard, dry, and difficult to pass.

Common signs of sluggish gut motility include:

• Bowel motions less than once per day

• Hard or pellet-like stools

• Bloating and abdominal discomfort

• Feeling like you haven’t fully emptied your bowels

• Nausea or reflux

• Skin issues such as acne

Why More Fibre Isn’t Always Better

Fibre provides fuel for beneficial gut bacteria and helps add bulk to the stool.

But fibre also requires a healthy digestive system to be tolerated well.

If you have:

• An imbalanced microbiome

• Slow transit time

• Poor stomach acid or digestive enzyme output

• Low bile flow

then adding more fibre can increase fermentation in the gut, leading to more gas, bloating, and discomfort.

This is particularly true with highly fermentable fibres found in legumes, onions, garlic, and certain grains.

Before significantly increasing fibre, it can be helpful to first support digestion, improve motility, and address any underlying microbial imbalances.

Why the Microbiome Matters

Your gut microbiome plays an important role in stool consistency, motility, and overall digestive function.

When beneficial bacteria are reduced, or when opportunistic microbes become overrepresented, constipation can become more likely.

Certain microbes can:

• Slow intestinal transit

• Produce excess gas

• Alter bile acid metabolism

• Increase inflammation within the gut

This is why constipation and bloating so often occur together.

Factors That Can Slow Gut Motility

• Stress and Nervous System Function

The digestive system relies on the parasympathetic (“rest and digest”) nervous system. Chronic stress can reduce digestive secretions and slow bowel movements.

• Low Stomach Acid

Adequate stomach acid is required to initiate digestion and signal enzyme release and bile flow.

• Low Bile Flow

Bile not only helps digest fats, but also supports intestinal motility.

• Thyroid Function

Low thyroid activity commonly contributes to constipation.

• Magnesium Status

Magnesium helps relax the muscles involved in bowel movements.

• Hydration and Movement

Water intake and regular physical activity are simple but important supports for healthy bowel function.

Relieving Constipation Naturally

A personalised approach may include:

• Supporting stomach acid and digestive enzymes

• Improving bile flow

• Addressing microbiome imbalances

• Optimising magnesium intake

• Nervous system support

• Ensuring adequate hydration and movement

Once digestion and the microbiome are functioning more effectively, fibre is often much better tolerated and can become a valuable part of the long-term treatment plan.

Looking Beyond Fibre

Constipation is often a sign that the digestive system needs support at multiple levels.

Rather than continually adding more fibre, it can be more effective to ask why the gut is moving slowly in the first place.

When you address the underlying drivers, whether that’s stress, microbial imbalance, low stomach acid, or sluggish motility, bowel function often improves naturally.

If constipation continues despite changes to your diet, fibre intake and hydration, it can be helpful to step back and consider what else might be contributing. Looking at your symptoms alongside other aspects of your digestion may provide useful clues.

The Gut Rewire Starter Guide is a free resource designed to help you do this. It takes you through six clues to consider and helps you put together a Gut Symptom Summary to discuss with your practitioner.

Get the Free Gut Rewire Starter Guide

When to Seek Support

If you’re experiencing ongoing constipation, bloating, or discomfort despite eating well, a more personalised approach can help uncover what’s contributing to your symptoms.

At Plum Wellness, consultations explore digestive function alongside diet, lifestyle and other relevant factors to develop a personalised plan.

Book an initial consultation in Hawthorn or Brunswick East, or online via Telehealth.