By Araleena Isse | BHSc Naturopathy, Certified Metabolic Balance Practitioner
When we talk about gut health, most of the conversation centres on food.
What should we eat? What should we avoid? Do we need more fibre, probiotics or fermented foods?
And while nutrition is fundamental to digestive health, there are other factors that I think deserve considerably more attention.
Hydration, movement and digestive transit time.
These three elements are familiar to most of us. They're hardly revolutionary.
But what I find fascinating is how closely they interact, and how frequently they're overlooked when someone is struggling with persistent digestive problems or chronic inflammation.
I recently explored these relationships in a presentation at the Nutrition Futures Summit 2026, where I spoke about the concept of gut terrain.
It's an approach I've developed through more than 20 years in naturopathic practice, particularly when working with people whose symptoms remain difficult to resolve despite considerable treatment.
Because sometimes the most useful next step isn't another supplement or a more restrictive diet.
It's understanding the environment in which digestion is taking place.
What Do I Mean by Gut Terrain?
In natural medicine, we often talk about addressing the underlying causes of illness.
But sometimes we become so focused on identifying specific problems that we lose sight of the broader environment in which those problems are occurring.
We investigate the microbiome, assess food intolerances, explore inflammation and consider digestive enzymes.
All of these can be useful.
But I also want to know:
Is this person adequately hydrated?
Are they moving regularly?
And how efficiently are intestinal contents travelling through their digestive system?
These factors influence the environment in which digestion, absorption and microbial activity occur.
That's what I mean by gut terrain.
It's the bigger picture.
And when we're working with someone whose health has become particularly complicated, looking at that bigger picture can reveal opportunities that aren't always apparent when we focus on individual symptoms.
The Three Foundations of Gut Terrain
In my presentation, I brought together three important elements of digestive function.
1. Hydration: More Than Just Drinking Water
We all know water is important.
But we don't always appreciate how many physiological processes depend on adequate hydration.
Water helps maintain blood volume, supports circulation, contributes to normal digestive secretions and plays a role in stool consistency.
It's also involved in the production and flow of bile.
Bile is produced by the liver and plays an essential role in the digestion and absorption of fats.
It's also part of a much broader metabolic system, interacting with the gut microbiome and influencing bile acid signalling throughout the body.
In my presentation, I discussed early research exploring how water intake can influence bile secretion and gallbladder activity.
These findings are interesting because they remind us that hydration isn't simply about preventing thirst.
Water is actively involved in digestive physiology.
And for someone experiencing constipation or other digestive concerns, inadequate hydration may be one of several contributing factors.
Of course, drinking more water isn't automatically the answer to every digestive problem.
But understanding someone's actual fluid intake is a useful place to start.
2. Movement: Your Digestive System Needs It Too
Exercise is usually discussed in terms of fitness, weight management and cardiovascular health.
But movement also influences digestive function.
Physical activity affects circulation, metabolic regulation and intestinal motility.
And research has explored relationships between exercise, bile acid metabolism and the gut microbiome.
This is one of the things I particularly wanted to communicate during my summit presentation.
Movement isn't simply a way of burning calories.
It's a physiological input that can influence how different systems within the body function.
For someone struggling with constipation, appropriate movement may be an important part of improving bowel function.
And it doesn't necessarily mean going to the gym.
Walking, swimming, cycling, gardening and other forms of regular physical activity can all contribute.
The important consideration is choosing movement that suits the person's health, capacity and circumstances.
I've worked with people who are so inflamed, fatigued or uncomfortable that exercise feels almost impossible.
For those clients, prescribing more exercise without considering what they're physically capable of can be counterproductive.
Sometimes we need to begin gently and build capacity over time.
And sometimes we need to address the factors that are making movement difficult before expecting someone to become more active.
3. Transit Time: The Often-Missing Piece
Of these three foundations, digestive transit time is probably the one I find most frequently overlooked.
Transit time describes how long it takes for food residues to travel through the digestive tract.
And one of the most surprising things I've observed in clinical practice is that having a bowel movement every day doesn't necessarily mean intestinal transit is occurring at a normal rate.
Someone might report that they open their bowels daily and therefore assume everything is functioning well.
But when we explore their transit time, we may discover that intestinal contents are moving considerably more slowly than expected.
This can provide useful information when investigating constipation, bloating and other digestive symptoms.
Transit time influences how long intestinal contents remain in the gut, affecting microbial fermentation, stool formation and the movement of substances through the digestive system.
It's also closely connected with the metabolism and recycling of bile acids.
That makes transit time an important consideration when we're trying to understand the broader digestive environment.
Bile: The Connection Between Them
One of my favourite aspects of digestive physiology is bile.
We generally learn about bile in the context of fat digestion.
And that's certainly one of its major functions.
But bile acids also interact with the gut microbiome and participate in metabolic signalling.
The intestinal microbiome can modify bile acids, while bile acids themselves help influence the intestinal environment.
Some bile acids are reabsorbed and returned to the liver through what's known as enterohepatic circulation.
Others are excreted through the stool.
Hydration, intestinal motility, diet and microbial activity all contribute to the conditions in which these processes occur.
So rather than thinking about hydration, movement, transit time and the microbiome as completely separate concerns, I find it more useful to consider how they influence one another.
During the summit, I used a simple analogy to bring these relationships together.
Imagine your digestive system as a car journey.
Transit time is the car.
The microbiome is the passengers.
Bile is the fuel.
Hydration is the engine oil.
Movement is the road.
Each plays a different role.
But they need to work together for the journey to proceed smoothly.
It's a simplified picture of a much more complex system, but I think it captures something important.
We can't always improve digestive function by focusing on one component while overlooking the others.
Why More Fibre Isn't Always the Answer
One of the most common recommendations for constipation is to eat more fibre.
And increasing dietary fibre can certainly help many people.
But the relationship between fibre and bowel function is more complicated than simply adding larger quantities.
Different fibres influence stool bulk, water retention and microbial fermentation differently.
Their effects can vary depending on a person's existing bowel function, the type of constipation they're experiencing and how much fluid they're consuming.
Physical activity may also contribute to bowel function, although research findings vary and exercise isn't a substitute for appropriate medical assessment or treatment.
This is why I think it's important to understand someone's transit time and overall digestive function before simply adding more fibre.
For some people, increasing fibre is helpful.
For others, a different type of fibre, more appropriate hydration, movement or investigation of an underlying motility problem may be needed.
The goal isn't to apply the same recommendation to everyone.
It's to understand what's happening and make an informed decision.
How Do You Know Your Digestive Transit Time?
One of the simple observational tools I sometimes use with clients is the sweetcorn transit test.
The idea is straightforward.
You eat a serving of sweetcorn, note the time, and then observe when you first see recognisable corn in your stool.
Because the outer covering of sweetcorn is resistant to digestion, it can act as a visual marker as food residues move through the digestive tract.
It's not a diagnostic test and doesn't provide the detailed information available through formal gastrointestinal transit studies.
It also doesn't tell us exactly where a delay is occurring.
But it can give us a rough indication of transit and prompt useful conversations about bowel habits.
When someone has persistent constipation, significant abdominal discomfort, unexplained changes in bowel function or other concerning symptoms, appropriate medical investigation is important.
For me, the value of the sweetcorn test is that it encourages people to become more aware of a physiological process they've probably never thought about before.
And sometimes, that awareness is the beginning of a more useful conversation about digestive health.
Stop Guessing and Start Assessing
This was one of the central messages of my summit presentation.
As practitioners, we're often familiar with the importance of hydration, movement and bowel function.
But how consistently are we assessing them?
When we ask someone how much water they drink, do they actually know?
When we ask whether they're physically active, do we understand what that activity looks like in the context of their health?
And when someone reports regular bowel movements, are we exploring whether they're experiencing incomplete evacuation, altered stool consistency or delayed transit?
These are relatively simple questions.
But they can reveal important information.
I particularly like creating practical structure around hydration rather than simply telling someone to drink more water.
We might look at their morning routine, their work schedule and when they're realistically able to drink.
Their total fluid requirements need to be appropriate for their body size, activity, climate and medical circumstances.
Similarly, movement needs to be meaningful and achievable.
The person who is physically exhausted or struggling with pain may need a very different starting point from someone who is already highly active.
It's not about prescribing the same amount of water or exercise to everybody.
It's about assessing what's missing, understanding what's appropriate and helping people make changes they can actually maintain.
When Someone Is Too Unwell to Do What We Recommend
One of the challenges I encounter in clinical practice is working with people who are experiencing significant inflammation, fatigue or longstanding health problems.
They've often heard the same advice repeatedly.
Eat better.
Move more.
Drink more water.
Get enough sleep.
But they may be struggling to implement even the most basic changes.
And sometimes, the harder they try, the worse they feel.
This is where I think we need to approach treatment with greater understanding.
If someone is exhausted, in pain or has very limited capacity for movement, we can't simply tell them to exercise more and expect that to solve the problem.
We need to understand why movement is difficult.
We may need to begin with small, achievable changes and gradually build their capacity.
The same applies to hydration and nutrition.
A recommendation is only useful if someone can implement it safely and consistently.
And when a person begins to understand why a particular change matters, they're often much more willing to engage with it.
That's the difference between giving advice and helping someone build a genuine understanding of their health.
The Changes People Remember
Towards the end of my presentation, I reflected on something I've noticed after many years in practice.
When people look back on their treatment, they don't necessarily remember every supplement they took or every adjustment we made to their protocol.
But they often remember the practitioner.
And they remember the turning points.
The conversation that helped them understand what was happening.
The moment they realised they could influence their health.
Or the small, seemingly ordinary change that made a meaningful difference.
Sometimes it's as simple as establishing a morning hydration routine.
Sometimes it's discovering that regular walking helps their bowel function.
And sometimes it's understanding that their digestive symptoms are part of a bigger physiological picture.
These moments can be surprisingly powerful.
Because people are no longer simply following instructions.
They're beginning to understand their bodies and recognise what helps them function well.
That's where lasting change becomes possible.
Bringing Gut Health Back to Its Foundations
I love the complexity of naturopathic medicine.
I find the microbiome fascinating, and I enjoy exploring the relationships between digestive physiology, metabolic health and inflammation.
But after more than 20 years in practice, I've also learned that more complicated treatment isn't necessarily better treatment.
Sometimes we need to step away from the detail and look at the foundations.
Is this person drinking enough?
Are they moving in a way that's appropriate for them?
Is their digestive transit functioning well?
And how might these three factors be influencing the broader environment of their gut?
These questions won't explain every digestive condition or replace the need for medical investigation and targeted treatment.
But they can provide a valuable starting point.
Because improving gut health isn't always about adding something new. Sometimes it's about helping the body's fundamental processes work together more effectively.
And the most meaningful changes are often the ones people understand well enough to continue for themselves.
About This Presentation
This article is based on my presentation, The Triad Quietly Shaping Gut Ecology and Inflammation: Movement, Hydration and Motility, delivered at the Nutrition Futures Summit 2026.
The presentation explored the relationships between hydration, physical activity, digestive transit time, bile metabolism and the gut microbiome, and how these factors can be considered together in clinical practice.
Read the full presentation transcript on my Podcasts & Speaking page.
About Araleena
Araleena Isse is a degree-qualified naturopath (BHSc Naturopathy) and Certified Metabolic Balance Practitioner with over 20 years of clinical experience.
She is the founder of Alchemy Medicine, based in Eltham, Melbourne, where she works with clients in person and online, supporting digestive health, metabolic wellbeing, chronic inflammation and sustainable nutritional change.
Learn more at Alchemy Medicine.