Hi Reader,
Heartburn. Acid reflux. Indigestion.
For decades, we've been conditioned to think these symptoms automatically mean one thing: too much stomach acid.
It's a logical assumption. If acid is causing the burning sensation, then surely reducing acid must solve the problem.
But after reviewing hundreds of functional labs and working with clients experiencing chronic digestive symptoms, one of the biggest surprises has been how often I find myself investigating the exact opposite.
Not, "How do we reduce stomach acid?"
But, "Why might this person not be producing enough?"
Now, to be clear, excess stomach acid can absolutely contribute to symptoms in some people, and acid-suppressing medications have an important place in medicine. However, in the world of Functional Diagnostic Nutrition, we don't stop at symptom relief. We ask a different question:
Why is the symptom happening in the first place?
That shift in thinking often changes the entire investigation.
One of the most common misconceptions is that acid reflux proves there's too much stomach acid. In reality, reflux simply means stomach contents have travelled back into the oesophagus. The oesophagus has very little protection against acid, so even a relatively small amount in the wrong place can cause a significant burning sensation.
One proposed mechanism that may contribute in some individuals involves low stomach acid. When stomach acid is inadequate, food—particularly protein—may not be broken down as efficiently. Food remains in the stomach for longer, creating more opportunity for fermentation. Fermentation produces gas, gas increases pressure within the stomach, and that pressure can encourage stomach contents to move upwards through the lower oesophageal sphincter. The symptom is still acid reflux, but the physiology that contributed to it may not be excessive acid production at all.
The important point is this: the same symptom can arise from different underlying physiology. That's why symptoms alone rarely tell the full story.
This is one of the biggest mindset shifts in Functional Diagnostic Nutrition.
We don't assume digestive capacity is normal simply because someone doesn't experience severe bloating every day. Digestion is a process, and that process can gradually become less efficient years before obvious symptoms appear.
Sometimes the first clue isn't digestive discomfort at all.
It's someone who keeps developing nutrient deficiencies despite eating well.
Or someone who feels uncomfortably full after relatively small meals.
Or someone whose blood work repeatedly shows low iron or vitamin B12 without an obvious explanation.
These patterns tell me there's a conversation worth having about digestive function.
Stomach acid is often described as something that digests food.
In reality, it's the starting point for almost everything that follows.
Its first role is to begin protein digestion by activating pepsin, the enzyme responsible for breaking proteins into smaller peptides. But stomach acid also acts as a signal. As acidic food leaves the stomach, it tells the pancreas to release digestive enzymes and the gallbladder to release bile. Those enzymes help digest proteins, carbohydrates and fats, while bile is essential for fat digestion and the absorption of vitamins A, D, E and K.
Think of stomach acid as the conductor of an orchestra. If the conductor doesn't arrive, the musicians may still play—but rarely in sync.
When the first stage of digestion is compromised, every stage downstream has the potential to become less efficient.
One of the most overlooked consequences of low stomach acid is what it can mean for nutrient status.
Many nutrients cannot simply be absorbed the moment you eat them. They first need to be released from food before the small intestine has any opportunity to absorb them. Vitamin B12, for example, is tightly bound to protein in animal foods and must first be separated. Iron is more readily absorbed in an acidic environment. Minerals such as zinc, calcium and magnesium also depend, directly or indirectly, on healthy stomach acid for efficient absorption.
This is why I rarely get excited about simply suggesting four supplements because four nutrients are low.
Instead, I ask why the body is struggling to maintain healthy nutrient levels in the first place.
Because if digestive capacity has declined, adding more supplements without understanding why is often working around the problem rather than solving it.
So why might someone produce less stomach acid?
There isn't one answer, which is exactly why investigation matters.
Chronic stress is a major contributor. Digestion requires significant energy, and when the nervous system spends long periods prioritising survival, digestive secretions often become less of a priority. Ageing also naturally reduces stomach acid production, which is one reason vitamin B12 deficiency becomes increasingly common later in life.
One of the first things I also consider is H. pylori. While it's best known for its role in ulcers, it can also interfere with the stomach's acid-producing cells and alter the stomach environment. This is one reason persistent H. pylori infections are associated with iron deficiency and vitamin B12 deficiency in some people.
Long-term use of acid-suppressing medications may also influence digestive capacity over time. These medications can be incredibly helpful and appropriate when medically indicated, but they don't answer the question of why symptoms developed in the first place.
Even nutrient deficiencies themselves can become part of the cycle. Zinc is required for healthy stomach acid production, yet inadequate stomach acid can also reduce zinc absorption. It's one example of the interconnected feedback loops we frequently encounter in Functional Diagnostic Nutrition.
Thyroid function is another root cause I frequently consider. Thyroid hormones influence far more than metabolism—they help regulate digestive capacity itself. Reduced thyroid function has been associated with lower stomach acid production, slower gastric emptying and reduced gut motility, all of which can contribute to digestive symptoms over time. That's why a comprehensive thyroid panel is part of my functional blood chemistry review. Digestive symptoms are sometimes the body's way of pointing us towards a completely different system that deserves attention.
This is why I rarely make assumptions based on symptoms alone.
Instead, I build hypotheses from patterns.
Comprehensive functional blood chemistry might reveal recurring iron deficiency, a low ferritin, vitamin B12 deficiency, subtle changes on a full blood count suggestive of impaired nutrient status, or other patterns that tell us digestion deserves closer attention.
If appropriate, advanced functional testing such as the GI-MAP allows us to explore potential contributors further. Is H. pylori present? Is pancreatic elastase suggesting impaired enzyme production? Are inflammatory markers elevated? Is secretory IgA showing an immune system under strain? Is there dysbiosis that may be influencing digestive function?
None of these tests diagnose low stomach acid directly.
But together, they help us understand whether the digestive system has the capacity to do the job it's designed to do.
That's the difference.
If there's one thing I'd like you to take away from this article, it's this:
Stomach acid is not something your body produces by accident.
It's one of the most important digestive secretions you have.
Its job isn't simply to create an acidic environment. Its job is to initiate digestion, unlock nutrients from food, coordinate the rest of the digestive process and help protect you against unwanted microbes.
So if you're experiencing persistent reflux, indigestion, recurring nutrient deficiencies or ongoing digestive symptoms, don't just ask, "How do I reduce the acid?"
Ask a bigger question.
"Why might my digestive capacity have changed in the first place?"
Because in my experience, that's often where the most meaningful answers begin.
If you’d like to explore whether this approach to healing using a detailed health investigation and tailored healing protocols might be the right fit for you, you can book a free discovery call below.
If there's anything specific you'd like me to discuss in my coming newsletters or have a question about something I've written, just reply to this email - I'd love to hear your thoughts/questions!
In good health,
Yukta,
Functional Diagnostic Nutrition Practitioner (FDN-P) &
Founder, Wellness Mastery Practice
