The Short Answer

People with autoimmune conditions often struggle with digestion, including acid reflux, indigestion, and food sensitivities. Hydrochloric acid (HCl) and digestive enzymes help break down food properly, reducing inflammation and preventing undigested proteins from triggering immune reactions. Supplementing with both can improve symptoms and expand your tolerated food list.

Why autoimmune patients struggle with digestion

Do you have an autoimmune condition and also deal with acid reflux, indigestion, constipation, or feeling like there’s a brick in your stomach after you eat?

Or are you on a restricted diet to manage your condition but find you’re still reacting to an ever-shrinking list of foods?

If so, your digestion needs support.

Many things impact digestion, including autoimmune conditions, aging, poor brain function, and dietary choices. Sometimes the problem is a hypersensitive immune system reacting to foods because your digestive system didn’t break them down properly. Many people with unmanaged autoimmune conditions, including Hashimoto’s low thyroid, have poorly managed digestion.

The good news is that simple, targeted supplements can help improve your digestion and break down foods so they’re easier to process and less likely to provoke inflammation.

How low stomach acid causes inflammation in autoimmune patients

When you have an autoimmune condition, good digestion requires plenty of hydrochloric acid (HCl) and digestive enzymes. They both break down foods and help prevent inflammation.

The stomach naturally makes HCl. When it’s low, symptoms include:

• Feeling unwell after eating protein-rich foods
• Meat feeling like a brick in your stomach
• Acid reflux or heartburn
• Constipation

It may sound counterintuitive that low stomach acid causes heartburn. But this is actually common: low stomach acid allows undigested food to sit in the stomach too long and ferment. The small intestine resists allowing it forward, so the food backs up into the esophagus, where it causes pain and burning.

For people with Hashimoto’s low thyroid and other autoimmune conditions, this cycle becomes especially problematic because undigested food particles trigger additional immune reactions, increasing inflammation throughout the gut.

Digestive enzymes and the missing piece

Many people with poor digestion also have low pancreatic enzymes, which are necessary to break down foods so the immune system doesn’t react to them and cause additional inflammation.

When food isn’t properly broken down, two problems occur:

• Your body doesn’t absorb the nutrients it needs
• Your immune system encounters partially digested proteins and mounts a defensive response, creating or worsening food sensitivities

This is especially relevant for patients with autoimmune diseases, whose immune regulation is already compromised.

Supplement with HCl and enzymes for better digestion

Supplementing with HCl and digestive enzymes supports digestion, lowers inflammation, and helps you better manage your autoimmune condition.

Tips for supplementing:

• Take HCl when you eat protein-rich meals, especially meat
• Take broad-spectrum digestive enzymes with all meals, look for high-quality formulas containing pepsin, bromelain, proteases, and minimal fillers
• Start with lower doses and increase gradually as your system adjusts
• Work with a functional medicine doctor to monitor your response

Oral tolerance: why proper food breakdown matters for autoimmune patients

Your immune system naturally tolerates foods you eat regularly while responding appropriately to harmful bacteria and pathogens. This balance, called oral tolerance, is critical for patients with autoimmune diseases.

Properly broken-down food is one of the foundational ways to maintain good oral tolerance and reduce food sensitivities. When food isn’t digested well, partially digested proteins cross the intestinal barrier and trigger immune responses, a process that can expand your list of problem foods and worsen inflammation.

By supporting your digestion with HCl and enzymes, you’re not just reducing bloating or indigestion; you’re helping your immune system regulate itself more effectively.

Contact RedRiver Health and Wellness to work with a functional medicine doctor who understands how digestion impacts autoimmune health.