Beating Constipation with Dietary Fiber: Smart Consumption Tips (Soluble vs. Insoluble)

I make sure to eat vegetables and brown rice, which are supposedly good for constipation, so why does my stomach feel even more bloated, and my stool become harder?

You sit on the toilet for a long time, but nothing happens… and even when you manage to pass stool, it’s small and hard like goat pellets, leaving you completely unsatisfied. Is this perhaps your story?

You might be feeling frustrated, thinking, ‘I’ve tried everything.’

Hello, I am Choi Yeon-seung, a Korean medicine doctor who has treated countless patients with refractory constipation for 15 years.

Many people come to me with precisely these concerns.

If you read this article to the end today, you won’t have to waste your efforts anymore. You will gain a fundamental understanding of why your stool has become hard like goat pellets, and the ‘real solution’ to break the vicious cycle of this stubborn constipation.

'Sponge' and 'Scourer': The Two Faces of Dietary Fiber

Everyone knows that dietary fiber is the key to escaping constipation. However, depending on 'which' dietary fiber you consume, the results can be a world of difference.

There are broadly two types of dietary fiber. I often compare them to a 'soft sponge' and a 'rough scourer.'

1. Soluble Dietary Fiber (Soft Sponge)

As the name suggests, this beneficial component dissolves in water and transforms into a sticky gel. This gel, much like a sponge soaked with water, supplies moisture to hard stool, making it moist and soft. It also 'gently' increases stool volume, creating an optimal state for the intestines to push the stool out.

Representative foods: Seaweed like kelp and wakame, oats (oatmeal), avocado, chia seeds or flax seeds that turn jelly-like when soaked in water.

2. Insoluble Dietary Fiber (Rough Scourer)

This type does not dissolve in water. Instead, it maintains its shape as it travels through the intestines. Like a scourer cleaning a dish, it gently stimulates the intestinal walls to promote bowel movements and directly increases stool volume, acting to 'cleanse' the intestines.

Representative foods: Brown rice, whole grains, legumes, and the tough stems or peels of most vegetables.

Now, we have two tools: the 'sponge' to soften stool and the 'scourer' to cleanse the intestines. So, which tool should we use for our constipation?

This is where it gets really important.

So, are foods rich in both types always good? Many people might have this question.

"Then, aren't foods rich in both soluble and insoluble dietary fiber the best option?"

Yes, in principle, that is correct. For individuals with healthy gut function, foods that contain both, such as apples, beans, and broccoli, can be the best choice.

However, for those whose gut function is already impaired or who suffer from stubborn constipation, these 'perfect' foods can become an overwhelming 'task' instead.

Too Many Tasks for a Weakened Gut

It’s like assigning two big projects to an exhausted employee at once, which actually decreases efficiency. Our intestines are the same. When digestive function is already weak, trying to handle both the 'sponge' role of softening stool and the 'scourer' role of stimulating the intestines simultaneously can be overwhelming.

Moreover, these complex foods are often 'High-FODMAP' foods, which can cause more gas in the intestines, actually leading to more bloating.

'Separation' and 'Focus' First

Therefore, the more sensitive and weak your intestines are, the safer and more effective it is to start with 'simple' foods that have a clear purpose, rather than foods that combine two functions.

This is similar to personal training, where instead of randomly mixing various exercises, you first strengthen your weakest areas.

What's Your Constipation Type? The Tragedy of 'Wrong Matching'

Do I need a sponge, or a scourer? That depends on your type of constipation.

Using the wrong tool can lead to the tragedy of worsening the situation.

Case 1. 'Dry Type' with Dehydrated Intestines (Goat Pellets, Rabbit Pellets)

This is the most common and most stubborn form of constipation. When you pass stool, it's small, round, and very hard, like goat or rabbit pellets. This is a sign that your body lacks 'vital fluids (Jin-aek)' which act as lubricants, and that the stool has stayed in the intestines for too long, losing all its moisture.

Bad Matching: What happens if someone with this 'dry type' constipation eats only 'scourers (insoluble dietary fiber)' in an attempt to stimulate the intestines?

This is like adding more sand and gravel to a dry cement mix that lacks water. The mix only becomes harder and bulkier; it never softens. This can lead to the worst-case scenario where the stool gets severely blocked in the intestines, making elimination even more difficult.

Case 2. 'Atonic Type' with Weak Intestines (Bulky but Difficult-to-Pass Stool)

The stool isn't particularly hard. In fact, it's rather bulky and soft, but oddly, you have to strain hard to pass it, and even afterwards, you're left with an unsatisfying feeling of incomplete evacuation. This indicates a lack of 'vital energy (Gi-un)'—the power to push stool out—preventing the intestines from performing peristalsis properly.

Correct Matching: In this case, 'scourers (insoluble dietary fiber)' can be a good solution. They gently stimulate the intestinal walls, acting to "wake up" the intestines and get them to move, as if saying, "Time to get to work!" However, always remember that sufficient water intake is an essential prerequisite here.

Case 3. 'Worst Complex Type' – Both Dry and Atonic

This is the most chronic and challenging type. The stool exhibits characteristics of both 'dry type' (hard) and 'atonic type' (lack of intestinal movement). In such cases, indiscriminately increasing insoluble dietary fiber can worsen the situation, so a 'staged approach' is absolutely necessary.

Now, what are the specific solutions tailored to your constipation type?

[Dry Type Solution]: Focus on 'moisturizing'!

The top priority is to supply lubricating fluids to the parched intestines, like bringing much-needed rain to drought-stricken land.

Eat 'sponges': Try chia seeds or flax seeds, which absorb water and turn jelly-like, by soaking them in yogurt or water. Consistently eating seaweed like wakame and kelp as side dishes is also an excellent method. They directly make the stool moist and soft.

Eat 'good oils': Just as a dry machine needs oiling, our intestines need lubrication. A spoonful of extra virgin olive oil on an empty stomach in the morning, or generously drizzling perilla oil over seasoned vegetables, acts as an excellent lubricant, coating the intestinal walls and helping hard stool pass smoothly.

[Atonic Type Solution]: Focus on 'getting it moving'!

The top priority is to gently awaken the dormant intestines and get them to work on their own.

Utilize 'scourers': Always ensure you drink plenty of warm water. Add side dishes like dried radish greens (siraegi) or bracken (gosari), and various mushrooms to your diet to gently stimulate the intestines.

Move your body directly: Physically stimulating the intestines from the outside is also very effective. Gently massage around your navel in a clockwise direction, or walk for more than 30 minutes a day to awaken intestinal peristalsis.

[Complex Type Solution]: The '2-Stage Approach' is Key!

For this most stubborn type, 'sequence' must be followed.

1. Stage 1 (First, moisturize): For the first 1-2 weeks, focus exclusively on the 'dry type' solution. Don't think about anything else; aim only to adequately moisten and lubricate the intestines with soluble dietary fiber, good oils, and warm water, with the sole goal of softening hard stool.
2. Stage 2 (Then, get it moving): Once you feel the stool becoming a little softer, then 'carefully' begin to add the 'atonic type' solutions: insoluble dietary fiber and exercise. The goal is to push out the softened stool from Stage 1 with the awakened intestinal strength from Stage 2.

In this way, applying the correct sequence and methods tailored to your constipation type is the most certain key to breaking the vicious cycle of stubborn constipation.

Understanding Your Body is the First Step

Many people suffering from constipation only focus on 'what more to eat.' But as we’ve learned today, the real key to overcoming stubborn constipation is not mere addition, but the wisdom of accurately understanding your condition and filling it with the 'right type' in the 'right sequence.'

If your intestines are like a dry desert, you should first moisten them with a soft sponge, rather than scrubbing with a rough scourer.

Today, we explored how to manage constipation through diet. However, many people, out of desperation, rely on stimulant laxatives. I will certainly delve deeply into why this can be a more dangerous choice in the long term, if the opportunity arises soon.

Your body is constantly sending signals. 'Understand' those signals and try one solution at a time that aligns with them.

We will always be with you, so that the bathroom can become a comfortable space, not a dreaded one.

[This content was personally written and supervised by the medical staff of Baengnokdam Korean Medicine Clinic.]

[References]

[1] Rao, S. S., Sadeghi, P., Beaty, J., & Kavlock, R. (2020). Ambulatory 24-h colonic manometry in slow-transit constipation. Neurogastroenterology & Motility, 32(1), e13715.

#howtoeatdietaryfiber #chronicconstipation