Why Am I Still Constipated Even Though I Eat Lots of Fibre?
- Lisa Claire Dack
- May 13
- 6 min read
You have probably been told to eat more fibre so many times that you could recite it back in your sleep. More vegetables, more wholegrains and more seeds on everything. You have done it, you are doing it and you are still constipated.
That is not a willpower problem. Being constipated even though you eat fibre is not a fibre problem either. That is your body telling you something else is going on, and nobody has looked closely enough to find out what.
Why you are still constipated even though you eat fibre and what it might mean
Constipation is not about how often you go. It is also about how easy it is, how complete it feels, and whether your digestive system is generally happy or quietly struggling. When fibre is not working the way it should, it often means the conditions needed for healthy digestion are not quite in place.
Digestion is surprisingly complex. It depends on the right gut bacteria, adequate hydration, a well-functioning nervous system, healthy thyroid function, and even your stress levels. Fibre is brilliant, but it needs the right environment to do its job.
Signs this might be what is going on for you
Going fewer than three times a week, or feeling incomplete afterwards Stools that are hard, pellet-like, or difficult to pass
Bloating that gets worse when you eat more vegetables or fibre
Feeling sluggish, heavy, or uncomfortable in your abdomen
Skin that is dull or breaking out more than usual
Fatigue that does not improve with sleep
Symptoms that get worse at certain times of the month
Root causes that fibre alone will not fix
This is where things get interesting, and where the standard advice often misses the mark.
Not drinking enough water is one of the most common culprits. Fibre needs fluid to bulk up and move through the gut. Without it, extra fibre can actually make constipation worse.
A sluggish thyroid may also be a factor. Low thyroid function can slow the entire digestive system down, and it is often underdiagnosed, particularly in women over 40. This is sometimes the missing piece that nobody has looked at.
Gut bacteria imbalances often play a role too. The microbiome helps ferment fibre and keep things moving. If beneficial bacteria are low, or if there is an overgrowth of the wrong kind (as in SIBO), fibre can cause bloating rather than relief.
Stress and a busy, switched-on nervous system can put digestion on the back burner. When your body is in a constant state of doing, it tends to push digestive function down the priority list.
Hormone shifts, particularly around perimenopause, can affect gut motility. Oestrogen and progesterone both influence how quickly food moves through the digestive tract, which is why many women notice changes in their digestion in their 40s and beyond.
Certain medications, including some pain relievers, antidepressants, and iron supplements, may also contribute. And magnesium deficiency, which is extremely common, can affect the muscle contractions that keep things moving.
What your GP will usually suggest and why it often is not enough
If you have brought this up with your GP, there is a good chance the conversation went something like this: eat more fibre, drink more water, maybe try a laxative. Come back if it does not improve.
And you went home, added more seeds to your porridge, and nothing really changed.
That is not a criticism of your GP. They are working within a system that does not leave much room for digging deeper. But if you have already done the basics and you are still struggling, the standard advice has simply reached its limit. It is not that there is nothing wrong. It is that the right questions have not been asked yet.
My functional approach to getting to the root of it
When I work with clients experiencing this, the first thing I do is look at the full picture rather than the symptom. Constipation is a signal that something in the system needs support, and my job is to work out what that is for that specific person.
What I look at
I will take a detailed history covering diet, stress, sleep, energy, cycle patterns, and any other symptoms that seem unrelated but often are not. Skin issues, migraines, fatigue, and bloating alongside constipation can all point in the same direction.
What I might test
Depending on what comes up, I may recommend a comprehensive stool test to look at gut bacteria, digestion markers, and signs of inflammation. A DUTCH hormone test can reveal how hormones are being processed. Thyroid panels beyond the standard TSH, and nutrient levels including magnesium and B vitamins, can all be incredibly illuminating.
What I support
From there, I put together a personalised plan. This might include targeted probiotic support, specific gut-healing nutrients, magnesium supplementation, hormone support, stress regulation techniques, or simply recalibrating the diet in a way that works with someone's specific gut rather than against it.
Five things worth trying right now
Drink a large glass of water first thing in the morning, before anything else. Warm water with a slice of lemon can help stimulate digestion.
Take a magnesium supplement in the evening. Magnesium citrate or glycinate are well absorbed and often gently effective. Always check with a healthcare professional if you are on medication.
Move your body every day, even a 20-minute walk. Physical movement helps stimulate peristalsis, the wave-like contractions that move things along.
Try not to ignore the urge. Rushing around and overriding your body's signals is more common than you might think, and can gradually dampen the reflex over time.
Reduce fibre temporarily if you are very bloated. Switching to cooked vegetables rather than raw, and reducing very high-fibre foods, can sometimes give the gut room to settle before building back up.
Gut-supportive golden porridge
This is not a generic healthy breakfast, each ingredient is doing something specific. Soaked oats are gentler on the gut than dry-cooked ones and provide a slow-release prebiotic fibre that feeds beneficial bacteria. Ground flaxseed adds soluble fibre that softens stools and supports regularity without the bloating that some high-fibre foods can cause. Ginger and turmeric are both anti-inflammatory and help stimulate digestive movement. Almond butter adds healthy fat, which matters. Fat is a natural trigger for the gastrocolic reflex, the signal that tells your bowel it is time to move.
40g oats, soaked overnight in water
1 tsp ground flaxseed
1 tsp ground ginger
150ml warm oat milk, almond milk or water
1 tbsp almond butter
A few blueberries or half a sliced banana to top
Cook the soaked oats gently with warm milk, stir through the spices and flaxseed, and top with almond butter and fruit. Eat it slowly, sitting down if you can. Digestion starts before the first bite, and giving your body a calm five minutes makes more difference than most people realise.
Constipation when you are already eating well is not a sign that you are failing at nutrition. It is often a sign that your body needs a bit of detective work, not more bran flakes.
For many clients, sorting out their digestion has had a knock-on effect on their energy, their skin, their hormones, and even their mood. Everything is connected, and your gut health really is a good place to start.
If you have read this far and thought "this is exactly me," that recognition matters. It usually means your body has been trying to get your attention for a while, and you have been managing symptoms rather than getting to the bottom of them.
I offer a free 20-minute Health Review where we can talk through what you have been experiencing, what you have already tried, and whether working together would be a good fit.
If you are ready to stop guessing, I would love to hear from you.
About Me
I am Lisa Claire Dack, a registered Nutritional Therapist specialising in gut health, hormones, fatigue and weight. I work one-to-one with busy people who have been struggling with symptoms like bloating, digestive issues, exhaustion and hormonal changes for longer than they should have had to, and who are ready to understand what is actually driving them.
My approach is rooted in functional medicine. That means looking at the full picture, not managing symptoms in isolation, but finding out what is going on underneath and building a realistic, personalised plan around your life rather than despite it.
If you are ready to feel more like yourself again, I would love to hear from you. You are welcome to book a free 20-minute consultation and we can talk through where you are and whether I can help.
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