The Hidden Gene That Might Be Making You Tired: Understanding MTHFR and the Magic of Methylation
Have you ever wondered why, despite eating well, exercising, and trying to live a balanced life, you still feel off?
Maybe you wake up tired, feel irritable for no reason, or notice your mood dipping even when life is good. Perhaps your brain feels foggy, or your energy just doesn’t match your ambition?
Like me you might have told yourself you’re getting older, working too hard, or not sleeping enough but sometimes, the answer goes deeper right down to your genes.
Inside every cell of your body is a tiny, brilliant engine that keeps you alive and thriving. One of the key parts of that engine is a process called methylation which is the mechanism that allows your body to detoxify, repair DNA, produce energy, and even balance mood and hormones.
The MTHFR gene (short for methylenetetrahydrofolate reductase) is responsible for activating this process. Its main job is to convert folate, the B vitamin found in leafy greens, into methylfolate, the form your body can actually use.
If you carry a variation of this gene and many of us do, your methylation system runs a little slower. That means your body may not fully activate certain B vitamins, especially folate (B9) and B12, which are critical for everything from brain function to energy production.
When your body doesn’t methylate efficiently, it can feel like you’re driving a car with dirty spark plugs. Things still run, but not quite right. You might notice fatigue and low energy; weakness or poor recovery after exercise; depression or mood swings; irritability or anxiety; headaches; difficulty thinking or remembering things; tingling or numbness in your hands and feet; constipation or sluggish digestion and insomnia or poor sleep.
When I was pregnant with Skylar I noticed that one of my eyes was protruding and when I asked my doctor he suggested that I was stressed. He recommended a Vitamin B complex supplement which I took and immediately noticed so many symptoms dissapear. More recently I learned about the MTHFR gene and the need for methylation assistance.
Your body needs B vitamins to function. They are like the spark plugs for your metabolism but if your MTHFR gene isn’t converting them properly, you can take multivitamins or eat well and still be deficient at the cellular level.
That is where methylated B vitamins come in; these are the active, bioavailable forms of Vitamin B that your body can use immediately, without needing to convert them. Consider the following:
Methylfolate (not folic acid) — the usable form of folate.
Methylcobalamin — the active form of vitamin B12.
Pyridoxal-5-phosphate (P5P) — the active form of B6.
When you take these versions, your cells finally get the nutrients they’ve been craving. You may notice your mood lift, your energy return, and your brain feel clearer.
When methylation slows down, your body also struggles to:
Detoxify: chemicals, heavy metals, and even hormones can build up.
Regulate mood: serotonin, dopamine, and melatonin all depend on methylation.
Repair DNA: your body’s ability to heal itself declines.
Balance homocysteine: high levels (a byproduct of poor methylation) increase risk for inflammation and cardiovascular strain.
That fogginess or fatigue isn’t “in your head.” It’s in your cells. Discovering you have an MTHFR variation isn’t bad news. It’s useful news and can be done simply with a salve test sent to you in the mail. You simply swab the inside of your mouth and return the kit to the lab. Knowing your genetics gives you insight as to what to do to feel better.
By supplementing with methylated B vitamins and living a lifestyle that supports methylation, you can feel remarkably lighter. Simple dietary changes can also make a world of difference: eat a colorful, whole-food diet rich in greens, eggs, beets, and clean protein; reduce alcohol and processed foods which deplete B vitamins; support your liver with hydration and antioxidants; manage stress as chronic worry burns through your B vitamins quickly; move daily and breathe deeply as oxygen helps your cells detoxify.
I believe our bodies are always whispering messages which we should pay attention to, seen in fatigue, mood swings and/or subtle aches and brain fog.
The MTHFR gene is simply one of those whispers, reminding us to tune in.
Understanding your unique biology is not a limitation it’s an invitation to live with awareness and when you give your body what it needs to do its job well, you unlock your natural vitality, clarity, and joy.
You are not broken. You are beautifully designed and once you learn your body’s language, life becomes lighter.
written by Marjolein Brugman
Marjolein Brugman is the founder of lighterliving and Aeropilates. “lighterliving is a movement and lifestyle choice we can all make. Let’s make it simple – make one decision a day to be better and watch the small steps lead to big changes. Eat smart, stay active, and you’ll live to feel a lighter life."
