Shelly Manning

How does high-fiber diet affect calcium absorption and bone health, what nutrition studies reveal, and how does this compare with high-fat diets?

Hello, this is Mr. Hotsia.

I’m writing this from my home in Chiang Rai, Thailand. I am 56 years old¹, and my body is a “log book” of my life’s work. For 30 years, that work was non-stop travel. My “job” was to visit every province in Thailand, Laos, Cambodia, Vietnam, and Myanmar, with a camera and an open mind².

My real “research,” though, was eating.

I’ve eaten my way across 3,000 kilometers of Vietnam, from the phở in Hanoi (served with a mountain of herbs) to the coconut-milk bánh xèo in the south. I’ve shared meals with farmers in Laos where the “main dish” was sticky rice and a plate of phak (foraged vegetables). And I’ve eaten my own restaurant’s “Kaphrao Sajai” here in Chiang Rai, which is fiery, full of herbs, and served with pork³.

I have eaten the high-fiber life. And I have eaten the high-fat life (hello, Thai curry).

Now, I live a second life. I’m a systems analyst by training⁴. Since I retired from government service, I’ve built a career as a professional digital marketer, a life that earned me the ClickBank Platinum Award in 2022⁵

My new job is to analyze data. I run over 40 websites ⁶ and I research “high intent keywords” for a US audience. And I see a war.

In one corner, you have the High-Fat “Keto” trend. In the other, the High-Fiber “Plant-Based” trend. Both promise health. But as a 56-year-old man who wants his bones to last, I see a critical question: What are these two extreme diets doing to our calcium?

I’ve researched this for years, both for my own health and for my business ⁷. The answer is not what you think.

🌾 The “Fiber” Story: Friend or Foe?

My 30 years in Southeast Asia taught me this: the local diet is not “low-carb.” It is rice-based. And it is insanely high in fiber. Not the “bran” in a box, but the real stuff: bamboo shoots, morning glory, leafy greens, young mangoes, endless herbs.

This seems like a problem.

The “Old Data” (The Problem):

My research for my health sites showed me the “old” data. Fiber, specifically insoluble fiber, can be a thief.

• Phytates (in rice bran, legumes) and Oxalates (in taro, spinach, rhubarb) are “anti-nutrients.”
• They are chelators. This is a chemical term. It means they grab minerals—like calcium, zinc, and iron—and bind to them.
• Once bound, your body can’t absorb the calcium. You just… poop it out.
• Based on this data, that high-fiber Vietnamese diet I loved should be a disaster for bones.

But it’s not. The farmers I met were wiry, strong, and working in their 70s. Why?

The “New Data” (The Real Story):

The new data changes everything. It’s not about the fiber. It’s about the gut.

This is the “Gut-Bone Axis.”

1. Not all fiber is a thief. The “thief” is the insoluble kind.
2. Soluble & Fermentable Fiber (the kind in garlic, onions, leeks, and “soft” greens) is prebiotic.
3. This prebiotic fiber is food for your gut bacteria.
4. When your gut bacteria eat this fiber, they produce Short-Chain Fatty Acids (SCFAs).
5. This is the magic bullet. SCFAs (like butyrate) change the entire system.
   • They lower the pH of your colon. This acidic environment dissolves minerals, making calcium more soluble and easier to absorb.
   • They strengthen the gut lining, improving all absorption and “gatekeeping.”
   • They reduce systemic inflammation, which is the #1 enemy of bone. Inflammation tells your body to break down bone. SCFAs tell it to calm down.

So, the “old way” I saw in Asia works. The fiber (from the phak) feeds the gut, which creates the very mechanism to absorb the calcium from the tiny fish and tofu. It’s a perfect system.

🧈 The “High-Fat” Story: The Real Danger

Now, let’s look at the “Keto” trend from my keyword research.

My “ground truth” from Thailand is that we are not fat-free. We love coconut milk (a fat). We love pork belly. Fat is flavor.

But the extreme “Keto” diet—where 70-80% of calories come from fat—is a different animal. What does that do to calcium?

The “Data” (The Problems):

My “systems analyst” brain 8 sees two major risks in the data.

1. The “Soap” Problem (Saponification):

   This is literally what it sounds like. If you flood your gut with too much fat, and it’s not absorbed, that fat can bind with calcium in your intestine. It forms a waxy, “soapy” substance… which you also poop out. This is a direct theft of your calcium.

2. The “Acid” Problem (Metabolic Acidosis):

   This is the real danger. A poorly formulated high-fat diet (one that is just meat and fat, with no vegetables) is highly acidic. Your body must keep your blood pH in a tight range. To “buffer” this acid, your body’s one and only solution is to steal an alkaline mineral.

   • And what is the biggest “bank” of alkaline minerals in your body?
   • Your bones.
   • Your body will leach calcium phosphate from your skeleton to neutralize the acid from the diet. You are literally dissolving your bones to fuel your diet.

The “Nuance” (The “Good” Fat):

Now, is all fat bad? No. A smart high-fat diet (like a Mediterranean diet) includes fats (olive oil, avocados, nuts) with the fiber (vegetables).

And high-fat foods (like egg yolks, cheese, and grass-fed butter) are the only good source of Vitamin K2. K2 is the “traffic cop” for calcium. It tells the calcium where to go—into your bones, and out of your arteries.

So, fat gives you the “traffic cop” (K2), but too much of it steals the “car” (calcium).

📊 Table 1: Mr. Hotsia’s “Systems Analysis” (Fiber vs. Fat)

As a systems analyst, I see inputs and outputs. Here’s the system.

⚖️ The Traveler’s Conclusion: The “Extremist” is the Enemy

I’m 56 years old. I’ve spent 30 years on the road. Here is my “ground truth.”

The problem is not “fiber” or “fat.” The problem is the extremist.

My “systems analyst” brain ⁹ sees it clearly:

• A “Vegan” (zero-fat) diet is high in fiber, but it has no “traffic cop” (K2).
• A “Keto” (zero-fiber) diet is high in fat (and K2), but it starves the gut and acidifies the body.

Both of these break the system.

The real diet, the “old way” I’ve seen from Chiang Rai to Hanoi, is both.

• It’s a Thai gaeng phet (coconut fat) served with a mountain of fiber (vegetables, herbs, and rice).
• It’s a “systems” diet. The fat provides the K2. The fiber feeds the gut, which unlocks the minerals.

Your body is not a “fat” or “fiber” machine. It’s a system. Stop giving it one thing. Give it everything it needs to run.

📊 Table 2: The “Good” vs. The “Bad” (My Action Plan)

So, how do we use this? As a researcher, here is my “action plan.”

🙋‍♂️ My Research FAQ (Frequently Asked Questions)

1. So, are phytates and oxalates (from fiber) a real danger or not?

They are a real chemical mechanism. But they are not a real-world danger if you have a healthy gut. Why? 1) The “old ways” of soaking, sprouting, and fermenting (which I saw everywhere in Asia) neutralizes them. 2) A healthy gut (fed by other fibers) can break them down. The problem is eating raw spinach in a “dead” gut.

2. Is a Keto (high-fat) diet definitely bad for my bones?

A lazy, acidic one is. It’s a mathematical certainty; you will leach calcium. A “smart” Keto—one that is high in alkaline vegetables (avocados, greens), cheese (for K2), and monitors for acidity—is different. But as a 56-year-old, I find that a very high-risk, high-maintenance system.

3. What’s the best fiber for my bones, then?

Prebiotic fiber. This is the “food” for your gut. The data is clear: this is the system-builder. You don’t need a fancy powder. It’s garlic, onions, leeks, and asparagus. It’s what I’ve been eating in stir-fries for 30 years.

4. Wait, can I eat High-Fat and High-Fiber?

Yes! This is the “secret” my 30 years of travel taught me. This is the “ground truth.” The Western “war” is a scam. They belong together. An avocado (fat) on whole-grain toast (fiber). A Thai curry (fat) with rice and vegetables (fiber). This is the balanced system.

5. Mr. Hotsia, what’s your “bone” diet?

I’m a systems analyst and a traveler. My diet is data-driven and real. I eat at my own “Kaphrao Sajai” restaurant10. It’s spicy, full of holy basil and chili (fiber and anti-inflammatories). I eat it with pork (a fat) and rice. It’s the “old way.” It’s balanced. It’s the real food I’ve seen work for 30 years.

I’m Mr.Hotsia, sharing 30 years of travel experiences with readers worldwide. This review is based on my personal journey and what I’ve learned along the way. Learn more