More Than MTHFR:
Why Your DNA Results Deserve a Bigger Conversation
MTHFR is probably the best-known genetic variant in natural health, but it’s only one small piece of a much bigger picture.
Your genes influence everything from gut health and inflammation to histamine tolerance, stress resilience, detoxification and how you respond to different foods. Looking at one gene in isolation rarely explains why you’re experiencing symptoms.
The value of DNA testing isn’t finding “bad genes“. It’s understanding how your unique biology works so treatment can be more targeted and personalised.
If you’ve ever had DNA testing, chances are you’ve heard of MTHFR.
But despite spending more than 10 years as the Senior Naturopath at MTHFR Support, it’s now quite unusual for MTHFR to be the genetic result that best explains why someone has come to see me.
I’ve met countless people who have been told they “have MTHFR”, advised to avoid folic acid indefinitely, or started taking large doses of methylfolate because of a DNA result they received years ago. Sometimes that advice is appropriate. More often, though, MTHFR turns out to be only a small part of a much bigger picture.
For many, it’s also created a lot of confusion. They’ve spent years worrying about one genetic result, wondering if it’s responsible for everything they’re experiencing. In reality, many of the people I see end up getting much more useful answers from genes they’ve never even heard of.
Unfortunately, the idea that you simply “have MTHFR”, almost as though it’s a diagnosis in its own right, has become far more common than the science supports. That’s largely a product of social media and Google, where complex biology is often reduced to a single genetic variant and a list of supplements.
“MTHFR is the rockstar of genetics. It’s the gene that gets all the attention, but methylation is a team effort. You can’t understand how it’s working by looking at one gene in isolation.”
-Kate Troup, Naturopath
Genes don’t work alone
One of the biggest misconceptions I see is that people assume each gene has a single job. It’s understandable because that’s often how genetics is talked about online: you have an MTHFR variant so you need methylfolate, or you have a COMT variant so you don’t tolerate methyl donors.
Almost every process in the body relies on multiple genes interacting with one another, while diet, sleep, hormones, stress, your microbiome and even previous infections all influence how those genes are expressed. That’s why two people can have exactly the same MTHFR result and look completely different clinically. One may have no symptoms at all, while another struggles with fatigue, migraines or histamine intolerance. The difference often isn’t the MTHFR gene itself, it’s everything else that’s happening around it.
The questions your DNA can help answer
Those questions usually involve multiple biological systems working together, not a single genetic variant.
If you’ve had DNA testing in the past and felt disappointed that it didn’t really answer your questions, this is often why. Looking at a single genetic variant in isolation rarely provides the whole picture. When your DNA results are considered alongside your symptoms, blood tests, microbiome and clinical history, they become much more useful because they can help explain why your body is responding the way it is.
What your symptoms might be telling us
If your main concern is ongoing gut symptoms, MTHFR may not be the most relevant place to start. Other genes can influence how your immune system interacts with your gut, how well you metabolise histamine, or even which bacteria are more likely to thrive in your microbiome. Looking at those pathways together often explains much more than focusing on methylation alone.
The same applies if fatigue is your biggest concern. Rather than focusing on methylation alone, it may be more helpful to understand the pathways involved in inflammation, antioxidant defence or mitochondrial function, depending on your individual pattern of symptoms.
This is why DNA testing shouldn’t start with the question, “Which genes should I look at?” It should start with, “What am I trying to understand?” Once that’s clear, your DNA results become much more useful because they’re helping explain why your body behaves the way it does, rather than simply giving you a list of genetic variants.
A few examples
If you’ve spent years wondering why you seem to react to foods that everyone else tolerates, your gut microbiome may be part of the answer. In some people, genes such as FUT2 influence the sugars secreted into the gut, which helps explain why some people naturally have lower levels of beneficial bacteria such as Bifidobacterium and why rebuilding the microbiome isn’t always as straightforward as simply taking a probiotic. It can also help explain why certain prebiotics work particularly well for some people, while others need a different approach.
Histamine is another good example. If you’ve suddenly become sensitive to wine, aged cheeses or fermented foods, it’s tempting to assume you simply need to follow a low-histamine diet. Sometimes, though, your genes are only one piece of the puzzle. Variants in genes such as DAO and HNMT may influence how efficiently your body metabolises histamine, but they also prompt a much more important question: why has histamine become a problem in the first place? The answer often lies in the interaction between your genes, gut health, hormones and immune system, rather than any one of those factors in isolation.
Inflammation is similar. Some people recover quickly after an infection or a stressful period, while others seem to stay inflamed for weeks or months afterwards. Inflammatory genes can sometimes help explain those differences, but they never tell the whole story on their own.
That’s really the recurring theme with genetics. Individual genes don’t cause disease, but they can help explain why your body responds differently from somebody else’s and, more importantly, guide a more personalised approach to treatment.
Your genes are not your destiny
One of the biggest misconceptions about DNA testing is that finding a particular genetic variant somehow predicts your future health. Fortunately, that’s not how genetics works.
Your genes matter, but they’re only one part of the picture. The way those genes are expressed is constantly being influenced by factors such as your diet, nutrient status, gut microbiome, hormones, sleep, stress levels and even past infections. That’s why two people with exactly the same genetic variants can have very different symptoms, or no symptoms at all.
This is why I see DNA testing as a tool for understanding your biology rather than diagnosing disease. On its own, a genetic result rarely tells us what’s causing your symptoms. Combined with your health history, blood tests and, where appropriate, microbiome testing, it often explains why your body responds the way it does and helps guide a more personalised treatment approach.
If there’s one thing I’d like you to take away from this article, it’s that your DNA is far more than a report full of gene names. Used well, it can help explain why your body responds the way it does and provide another piece of the puzzle when symptoms don’t seem to make sense. MTHFR is certainly part of that story, but it’s only one chapter.
