Why “Fiber Maxing” Won’t Fix Your IBS
If you’ve spent any time on social media lately, you’ve probably seen people talking about “fiber maxing”: adding chia seeds to everything, eating huge salads, loading up on beans, or aiming for 30–40g+ of fiber every day in the hope of improving gut health.
For some people, increasing fiber can absolutely be helpful. However, if you have IBS, more fiber is not always better.
In fact, for many people with IBS, aggressively increasing fiber can make symptoms worse.
The Problem
A lot of online gut health advice assumes everyone’s guts work the same, but IBS is far more individual than that.
If you have IBS, your gut may already be:
- More sensitive to stretching and gas
- More reactive to certain foods
- Struggling with bloating, urgency, constipation, diarrhoea, or pain
- Easily triggered by foods that are technically considered “healthy”
So when you suddenly start “fiber maxing,” your gut may respond with:
- More bloating
- More abdominal pain
- Excess gas
- Constipation
- Diarrhoea
- Feeling overly full or uncomfortable after meals
And that’s because not all fiber behaves the same way.
Not All Fibre Is Equal
One of the biggest misconceptions online is treating fiber like it’s one single thing.
Different types of fiber do very different things in the gut.
Some fibers:
- Add bulk and help regulate bowel movements
- Ferment rapidly in the gut and create gas
- Pull water into the bowel
- Slow digestion
- Feed our gut bacteria
For someone with IBS, certain fibers can be incredibly helpful, while others may trigger symptoms.
This is why copying someone else’s “high fiber gut health routine” often doesn't work.
Fiber overload
Many high-fiber foods are also high in FODMAPs; fermentable carbohydrates that can trigger IBS symptoms.
Foods commonly promoted during “fiber maxing” that may cause issues for some IBS sufferers include:
- Large amounts of legumes
- Wheat bran
- Onion and garlic
- Certain protein bars
- Huge smoothie bowls
- Excess dried fruit
- Large servings of cruciferous vegetables e.g. cauliflower and broccoli
- High doses of inulin or chicory root
These foods aren’t “bad" but when your gut is sensitive, quantity and type matter.
Adding multiple high-fiber foods at once can dramatically increase fermentation in the gut, leading to bloating, pain, and altered bowel habits.
What To Do Instead
1. Focus on Tolerable Fiber, Not Maximum Fiber
The goal shouldn’t be to eat as much fiber as possible. The goal should be finding the amount and types of fiber your body tolerates well.
Often, this means:
- Increasing fiber gradually
- Choosing gentler fiber sources
- Spacing fiber across meals
- Avoiding suddenly doubling intake overnight
2. Prioritise Soluble Fiber First
Many people with IBS tolerate soluble fiber better than coarse, highly fermentable fiber.
Examples of gentler fiber sources may include:
- Oats
- Kiwi fruit
- Chia seeds
- Psyllium husk
- Low FODMAP vegetables
- Firm bananas
Tolerance is still individual, but slower and gentler is usually better than “all in.”
3. Focus on variety, not volume
A varied intake of plant based foods does support gut health, but trying to cram as much fiber and as many “healthy” foods into your day as possible can sometimes overwhelm an IBS-sensitive gut.
Instead of chasing extremes, focus on:
- 30 different plant foods per week (from nuts, seeds, low fodmap lentils and legumes, grains, herbs and spices)
- Spread the variety over the week, not all into one day
- Foods your body actually tolerates
- Consistent, balanced meals
Sustainable habits usually work far better than “gut health hacks" when it comes to IBS.