If you’ve ever celebrated the healing power of traditional foods like bone marrow, only to find yourself bloated, sluggish, or constipated after eating it. Well, you’re not alone. Bone marrow is a prized food on the GAPS diet: it’s rich in healthy fats, fat-soluble vitamins, and nourishing compounds to rebuild the gut lining. So why would such a nutrient-dense superfood cause constipation?

Let’s break down what’s going on in the gut, and why sometimes “too much of a good thing”—especially fat—can backfire, at least for a time.

What Is Bone Marrow and Why Is It So Fatty?

Bone marrow is the soft, fatty tissue inside large bones (like femur bones). It’s composed mostly of saturated fat and cholesterol, along with stem cells, collagen precursors, and micronutrients. When roasted or simmered into meat stock, it becomes soft, buttery, and easy to scoop out and eat.

In the GAPS world, this kind of fat is essential: it feeds the brain, lubricates the gut, fuels the immune system, and helps with detox. So it’s encouraged early and often.

But for some of us—especially those with sluggish digestion, gallbladder issues, or poor bile flow—eating bone marrow can lead to unexpected constipation. Why?

The “Soap” Problem: When Bile Meets Fat

Dr. Natasha Campbell-McBride explains a fascinating phenomenon: when too much fat enters the gut and combines with bile, it can essentially turn into a kind of soap. This is based on a chemical reaction called saponification.

In the gut, bile is released from the gallbladder to help digest fat. Bile is alkaline, while fat is… well, fat. When these two mix under the wrong conditions (such as low stomach acid, inadequate digestive enzymes, or poor bile flow), they can form a sticky, drying substance that coats the inside of your intestines—much like soap.

This “soapy” mixture makes stool dry, sticky, and hard to pass. It can slow down peristalsis, the natural wave-like movement of the intestines. It may also irritate the gut lining, causing sluggish digestion or cramping. This leads to a feeling of being blocked, full, or heavy.

So while fat is vital, too much too fast—especially in the form of concentrated marrow—can literally gum up the works.

Other Reasons Bone Marrow Might Constipate You

In addition to the “soap” effect from bile and fat, here are other contributing factors:

1. Low Stomach Acid (Hypochlorhydria)
Without strong stomach acid, food (especially fats) isn’t properly broken down before it enters the small intestine. This sets the stage for fat + bile = soap.

2. Overwhelmed Liver or Gallbladder
If your bile isn’t flowing well—either from a congested liver, thick bile, or gallbladder dysfunction—it may not be able to handle the fatty load from marrow. The fat lingers and slows things down.

3. Lack of Fermented Foods
Ferments like sauerkraut juice, beet kvass, or kefir stimulate bile flow and help emulsify fats more effectively. Without them, digestion stalls.

4. Too Much, Too Soon
On GAPS, it’s crucial to introduce fats gradually. Jumping into large portions of bone marrow (or fatty cuts like oxtail or pork skin) without working up to it can overwhelm your system.

What Can Help?

If you’re constipated after eating bone marrow—or other fatty animal foods—try these GAPS-friendly strategies:

1. Don’t stop eating fat: Fat is healing, nourishing, and essential for detoxification, hormone production, and nervous system support. If you’re reacting to fat, that doesn’t mean you should cut it out—it means you need to support the organs and secretions responsible for fat digestion.
2. Supplementing with HCl (e.g., Betaine HCl with pepsin), ox bile with liapases, beetroot, milk thisle, danedlion and bitters. This is a supplement Bile Flow Plus I personally recommend—it’s clean, effective, and fits well within a GAPS-friendly healing approach.
3. Homemade meat stock to gently stimulate acid.
4. Avoid drinking large amounts of water with meals (it dilutes acid)
5. Introduce fat slowly, starting with small amounts in soup or mixed with meats, some actually benefit from introducing larger amounts of fat to release consipation – best to work with someone who can help you navigate through it.
6. Incorporate fermented foods before or with fatty meals to help digestion
7. Use enemas, especially coffee enemas, to stimulate bile release and relieve constipation
8. Ginger tea can help bile flow and soothe the digestive tract

Bottom Line

Bone marrow is a healing food, but context and timing matter. If you’re not digesting fats well, they can combine with bile to create a “soapy” residue that dries out the colon and slows everything down.

So don’t give up on marrow—but go gently. Build up your fat tolerance, support your bile flow, and listen to your gut. Healing is a process, not a sprint.

If you’re navigating symptoms and want support on your healing journey, you’re not alone—and you don’t have to figure it all out by yourself. I offer personalised guidance rooted in the GAPS Nutritional Protocol to help you understand what your body is telling you and how to move forward in a way that’s sustainable and nourishing.

Whether you’re just getting started or you’ve been on this path for a while and feel stuck, I’d love to support you.

Reach out to me (hello@monikaholland.com) to explore how we can work together.

The information shared on this blog is for educational and informational purposes only and is not intended as a substitute for medical advice, diagnosis, or treatment. Always consult with your qualified healthcare practitioner before making changes to your diet, supplements, or lifestyle—especially if you have a medical condition or are taking medication. Some blog posts may contain affiliate links to products I personally use, trust, and recommend as compatible with the GAPS Nutritional Protocol. Please note that not all links are affiliate links.