Constipation, Gut Health, Podcast

333// Constipation Relief: Do Fiber & Magnesium Actually Work?

September 10, 2026

Constipation Relief: Do Fiber & Magnesium Actually Work?

You've been told to eat more fiber.

So you eat more fiber.

Drink more water?

Your giant water bottle goes EVERYWHERE with you.

Try magnesium?

At this point, your supplement cabinet could open its own magnesium store. 😂

Citrate.

Oxide.

Powders.

Capsules.

And maybe you've graduated to MiraLAX, laxatives, or enemas.

Yet you're STILL asking:

Why am I constipated?!

I know this story because I lived it.

Constipation was the worst symptom I experienced when I was sick from 2015 to 2017.

And I was the definition of compliant.

I'm Type A.

I'm an A+ student.

Tell me what to do, and I'll DO IT.

I changed my diet.

I took supplements.

I worked on stress.

I eventually quit my job.

And guess what?

I still couldn't poop.

Nothing worked.

Those two years felt like an eternity.

Since figuring out how to help myself, I've worked with hundreds of people struggling with constipation.

I've seen slow transit constipation.

Megacolon.

Redundant colons.

People constipated for 10, 20, 30, even 40 years.

And I've repeatedly seen people who were told they'd always need laxatives finally make progress.

So I wanted to answer a different question.

What does the actual research say about our favorite constipation remedies?

Because when your constipation isn't going away, you may NOT need to try harder.

Maybe the standard advice simply isn't solving your problem.

Let's look at the numbers.

Fiber for Constipation: Does Dietary Fiber Actually Work?

Let's start with the darling of conventional constipation relief advice.

Fiber.

If you're constipated, someone has probably told you to eat more of it.

Doctors recommend it.

Google recommends it.

Your grandma probably recommends it.

And here's where I'm going to surprise you.

Fiber CAN help constipation.

Research discussed in this episode found a 66% effectiveness rate for fiber as a broad category.

That's not terrible.

Even more interesting?

Research focusing specifically on soluble fiber for constipation reported effectiveness as high as 86%.

That's important because not all dietary fiber works identically.

Soluble fiber vs. insoluble fiber for constipation

Soluble fiber absorbs water.

Insoluble fiber adds more roughage.

And according to the research I reviewed, insoluble fiber may increase bloating and gas without improving bowel movements.

So simply Googling high fiber foods for constipation relief and loading your plate isn't necessarily the solution.

Neither is blindly buying another fiber supplement.

Psyllium fiber, soluble fiber, insoluble fiber, and food-based fiber aren't interchangeable.

But there's an even BIGGER issue.

Remember that 86% effectiveness number?

Flip it around.

What about the other 14%?

Those people still exist.

Using the conservative constipation prevalence figures discussed in the episode, I estimated millions of Americans could remain unhelped.

And I was one of them.

I've met hundreds more.

People who eat vegetables.

Cook at home.

Exercise.

Take their supplements.

Follow ALL THE RULES.

Yet they're still constipated.

So if you're wondering, “Does fiber help constipation?”

The answer isn't simply yes or no.

It can.

But fiber isn't a universal fix.

And if fiber hasn't fixed your constipation, eating MORE may not solve the real problem.

Magnesium for Constipation: Does Magnesium Oxide or Magnesium Citrate Work?

Next up: magnesium.

If you've searched for constipation natural remedies, you've probably encountered magnesium.

Maybe you're wondering:

What's the best magnesium for constipation?

Magnesium citrate?

Magnesium oxide?

Some magical powder everyone on Instagram swears changed their life?

I wanted to know what the research actually showed.

One randomized, double-blind, placebo-controlled trial evaluated magnesium oxide for constipation.

It reported a 70% effectiveness rate.

Sounds pretty good.

Until you notice something important.

The study only included 33 people.

That's a very small study.

And even if we accept that 70% number?

Thirty percent didn't respond.

They still couldn't poop.

What about magnesium citrate for constipation?

During my research, I found magnesium citrate discussed more often for stimulating bowel movements.

Researchers often paired it with laxative use.

That's different from creating healthy, formed bowel movements you can consistently have on your own.

And THAT distinction matters.

Because the goal shouldn't simply be:

“How can I force myself to poop today?”

We need to ask:

“Why isn't my body doing this properly on its own?”

Those are two VERY different questions.

This also changes the conversation around which magnesium for constipation works best.

If you're deficient or magnesium supports your particular situation, that's one conversation.

But if you've tried oxide, citrate, powders, capsules, and increasing doses without lasting results?

Another form of magnesium may not address your root cause.

And I can't give you a universal magnesium for constipation dosage.

Your appropriate intake depends on individual factors and should involve your healthcare practitioner.

But I CAN tell you this:

You shouldn't assume magnesium failed because you picked the wrong bottle.

The research itself shows it doesn't work for everyone.

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Water for Constipation Relief: Does Drinking More Water Actually Help?

Okay.

This one might ruffle some feathers.

“Just drink more water.”

We've ALL heard it.

And adequate hydration matters.

But does water actually provide meaningful constipation relief naturally?

The research I reviewed was fascinating.

One study involved 141 people.

Participants already took fiber.

Researchers increased water intake from one liter daily to two liters.

What happened?

Their average bowel movement frequency moved from roughly:

Three bowel movements per week → four bowel movements per week.

Technically?

That's an improvement.

But come on.

We did not change the world here.

And this is where context matters.

The study increased intake from relatively low hydration to a more normal range.

That doesn't prove someone already drinking enough water will fix constipation by drinking MORE.

The transcript's research discussion did not identify evidence showing that increasing from two liters to three liters fixes constipation.

I've had clients drinking a GALLON every day.

You know those massive water bottles with motivational lines down the side?

Yep.

Those.

They were drinking the whole thing.

And STILL weren't pooping.

So if you're adequately hydrated, please stop assuming you haven't earned a bowel movement yet. 😅

More isn't always better.

Water may help when inadequate hydration contributes to the problem.

But endlessly “water maxing” isn't a root-cause constipation strategy.

If you're already drinking adequate water and remain constipated, investigate WHY.

MiraLAX Not Working? What Polyethylene Glycol 3350 Research Shows

Now let's talk about over the counter constipation relief.

Specifically, MiraLAX.

MiraLAX contains polyethylene glycol 3350, or PEG 3350.

And if you're dealing with chronic constipation, you may have used it for months.

Or years.

Maybe it worked initially.

Then it worked less.

Then you needed more help.

Or maybe you're at the point where you're saying:

“MiraLAX isn't working at ALL.”

So, does MiraLAX work?

One study discussed in the episode was funded by Bayer.

It examined polyethylene glycol 3350 for chronic idiopathic constipation.

The initial effectiveness?

42%.

Less than half.

But it gets more interesting.

When researchers evaluated sustained response over six months, effectiveness dropped to 33%.

That means about two-thirds weren't sustained responders at that point.

That number immediately resonated with me.

I've worked with people who reach a point where only a laxative produces a bowel movement.

I've also worked with plenty of people where laxatives stopped working.

And they STILL made progress when we approached constipation differently.

Now, this doesn't mean you should suddenly stop MiraLAX.

And this article isn't medical advice.

Talk with your healthcare practitioner before changing medications or treatment.

But if you're wondering how long can you take MiraLAX or why it's becoming less effective?

Don't automatically assume you need MORE.

Ask whether your current approach addresses why you're constipated.

Because producing a bowel movement and correcting the underlying dysfunction aren't necessarily the same thing.

Why Am I Constipated When Fiber, Magnesium, Water, and Laxatives Aren't Working?

THIS is the question I wish someone had asked me.

Not:

“Have you tried more fiber?”

Not:

“Which magnesium are you taking?”

Not:

“How much water did you drink today?”

But:

Why are you actually constipated?

The research in this episode showed something incredibly validating.

None of these approaches works for everybody.

Even the strongest result I found left a group of people without improvement.

And MiraLAX's sustained response was considerably lower in the study discussed above.
So if you've been following the advice without getting results, hear me:

You did not fail the advice.

The advice may have failed YOU.

That distinction matters.

Because I've met so many people who believe their chronic constipation means they aren't disciplined enough.

They need cleaner food.

More vegetables.

More water.

A better fiber supplement.

The best magnesium for constipation.

A higher dosage.

Another laxative.

Another enema.

NO.

At some point, repeating something that isn't fixing your problem stops making sense.

Chronic constipation can involve more than stool consistency alone.

In my work, I've seen people with diagnosed slow motility, slow transit constipation, megacolon, redundant colons, and pelvic floor dysfunction.

Some people poop daily yet still discover significant retained stool on imaging.

That's exactly why generic constipation advice has limits.

You need to understand what's actually keeping YOUR system stuck.

Constipation Natural Remedies vs. Root-Cause Constipation Relief

There's a huge difference between a constipation remedy at home and a strategy designed around your underlying problem.

A home remedy asks:

“What can make me poop?”

A root-cause approach asks:

“What is preventing normal bowel function?”

See the difference?

This is why endlessly cycling through constipation fiber and constipation magnesium can become frustrating.

You're changing the tool.

You're not necessarily changing the strategy.

Fiber might help.

Magnesium might help.

Correcting inadequate hydration might help.

MiraLAX might help.

Pelvic floor therapy might help certain people.

But what happens when it helps only PARTIALLY?

Or temporarily?

Or not at all?

That's where you need to stop asking which generic constipation remedy you haven't tried.

Start investigating what's missing.

In the episode, I mention people whose pelvic floor muscles aren't coordinating properly.

Pelvic floor therapy can remain important for them.

But I've also seen people improve only partially with pelvic floor therapy.

Sometimes another layer still needs attention.

And that's exactly why we're going deeper in this constipation series.

I'm breaking down the different layers we've found behind stubborn constipation.

Because I want you to understand something:

Constipation isn't a character flaw.

You aren't lazy.

You aren't undisciplined.

And needing something beyond fiber doesn't mean you're hopeless.

It means we need a better question.

Clear Your Constipation Challenge: A Different Approach to Chronic Constipation

This is exactly why I'm bringing back the Clear Your Constipation Challenge.

I'm looking for 100+ constipation cases.

Mild constipation?

Come join us.

Been constipated for decades?

Come join us.

Slow transit constipation?

Come join us.

Constipation mixed with diarrhea?

You can still participate.

This process focuses specifically on constipation and is designed for ages 12 and older.

Minors need a parent to sign up for them.

And we're NOT building this around telling you to eat more fiber.

We're not simply handing you another magnesium bottle.

We're not telling you to chew your food more and hope for the best.

The process we've used with clients takes a different approach.

During the six-week Clear Your Constipation Challenge, you'll work through the plan we're using to address stubborn constipation.

The program is designed to give participants a plan for pursuing measurable improvement over the following six months.

We'll also track results.

Because I'm interested in more than telling you our approach works.

I want DATA.

I want to create another way of looking at constipation.

And I want people who've spent years hearing the same four pieces of advice to finally have another option.

If you're ready to stop asking whether you need another fiber supplement...

Another type of magnesium...

Or another giant bottle of water...

Join the Clear Your Constipation Challenge waitlist.

That's your shortcut to stop repeating strategies that haven't solved your constipation.

And finally start asking the question that matters:

Why am I actually constipated?


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Quick Recap: What Constipation Research Says About Common Remedies

Here's what I want you to remember:

  • Fiber can help constipation, but it doesn't work for everyone.
  • Soluble fiber performed better than broad fiber categories in research discussed in this episode.
  • Insoluble fiber may increase bloating and gas without improving bowel movements.
  • One small magnesium oxide study reported 70% effectiveness.
  • Magnesium citrate appeared more often as a bowel-stimulating laxative strategy in my research.
  • Increasing low water intake may modestly improve bowel frequency.
  • More water doesn't automatically mean more constipation relief when you're already adequately hydrated.
  • The MiraLAX research discussed here found a 42% initial response and 33% sustained response.
  • If standard constipation remedies aren't working, doing MORE of the same isn't automatically the answer.
  • Stop only asking what will make you poop. Start asking why you're constipated.

You can also listen to Episode 178: Why Constipation Medicine Isn't Helping You and Episode 165: The Constipation Magnesium Myth for more constipation education.

Constipation Relief FAQ

Does fiber actually work for constipation?

It can. Research discussed in this episode found 66% effectiveness for fiber broadly. Soluble fiber reached 86% in one review. However, that still means fiber doesn't help everyone.

Does magnesium help constipation?

Sometimes. One 33-person randomized trial discussed in the episode reported 70% effectiveness for magnesium oxide. That also means some participants didn't respond.

Does water help constipation?

It may help when you're under-hydrated. One study increased water from one to two liters daily alongside fiber. Bowel movements increased from approximately three to four weekly.

Does MiraLAX work for chronic constipation?

It works for some people. The research discussed in this episode reported a 42% initial response. Sustained response fell to 33% over six months.

What should I do when laxatives aren't working?

Don't simply assume you need more laxatives. Work with an appropriate healthcare professional to investigate why constipation persists. If you're ready for a different approach, join the Clear Your Constipation Challenge waitlist.


Written by Allison Jordan, FDN-P — gut health specialist, founder of Better Belly Therapies, and host of the Better Belly Podcast. Allison uses a functional, root-cause approach to help clients investigate stubborn digestive and whole-body symptoms.


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