What is methylation?
Methylation takes part in several fundamental biological processes:
- production of glutathione, a principal antioxidant;
- detoxification of hormones, heavy metals and chemicals;
- regeneration of cells and tissue;
- regulation of the immune system;
- DNA repair and gene expression;
- transmission of nerve signals between cells;
- production of energy from nutrients.
When methylation is disturbed these processes can be impaired, leading to health problems such as chronic disease and premature ageing.
Production of glutathione
Glutathione is an important antioxidant that protects cells from damage by free radicals and toxins. Methylation plays a key role in producing and recycling glutathione in the body.
Glutathione is synthesised from three amino acids: glycine, glutamic acid and cysteine. Methylation supports the function of the enzymes responsible for this process. Glutathione works in several important ways:
- Neutralising free radicals — it protects the body from oxidative stress, which is linked to ageing and to conditions such as diabetes.
- Detoxification — glutathione helps the liver eliminate toxins from the body.
- Regenerating antioxidants — it restores antioxidants such as vitamins C and E to keep them active.
With a glutathione deficiency the body becomes more vulnerable to toxins and oxidative stress, which leads to chronic inflammation and other health problems.
Detoxification of hormones and toxins
Methylation plays an important role in detoxification — the process by which the liver and other organs filter and remove accumulated toxins and excess hormones. The liver uses methylation to break down:
- excess hormones such as oestrogen and cortisol, which when they accumulate can cause hormonal imbalance and health problems;
- toxins and chemicals we are exposed to every day;
- heavy metals such as mercury and lead, which can cause neurological and immune disorders.
If methylation is disturbed, the body cannot eliminate toxins effectively, which leads to inflammation, hormonal disturbance and serious illness.
Regeneration of cells and tissue
Methylation supports cell regeneration and DNA repair. This mechanism matters particularly for slowing ageing, helping the body repair damaged cells and produce new, healthy ones. When the process is disturbed, cell regeneration slows, which leads to premature ageing and a raised risk of disease.
Regulation of the immune system
The immune system is a complex network of cells and organs working together to protect the body from infection and disease. Methylation regulates:
- gene expression in immune cells, ensuring a proper immune response;
- the production of inflammatory molecules, which must be controlled to avoid chronic inflammation;
- autoimmunity, by maintaining the immune system's self-tolerance so it does not attack the body's own cells.
With disturbed methylation the risk of autoimmune disease increases, and the immune system can become weaker and more susceptible to infection.
The nervous system and nerve impulses
The nervous system works as a complex communication network between billions of nerve cells (neurons), which pass signals to one another through chemical substances called neurotransmitters. Methylation has a key role in producing and regulating these neurotransmitters, ensuring proper communication between brain and body.
How nerve impulses are transmitted
When one nerve cell wants to send a signal to another, it releases neurotransmitters — chemical messengers that cross the small space between the two cells, called the synapse. Methylation is important for several aspects of this process:
- Synthesis of neurotransmitters. Many of the most important neurotransmitters, such as serotonin, dopamine and adrenaline, are produced through processes that depend on methylation. Serotonin — the good-mood hormone — is produced thanks to the methyl groups that ensure the proper conversion of amino acids into this neurotransmitter.
- Regulating the amounts of neurotransmitters. Methylation also helps regulate neurotransmitter levels. Too much or too little can disturb nerve communication and lead to various mental and neurological disorders, such as depression, anxiety, paranoid schizophrenia and problems with concentration.
- Recycling neurotransmitters. Once a neurotransmitter has been sent and used, it has to be broken down or recycled. This process also depends on proper methylation, so that excess amounts of these substances do not accumulate and disturb brain function.
When methylation is disturbed, the balance of neurotransmitters can shift significantly. An excess can cause nervous overstimulation — states such as anxiety or psychotic episodes can be linked to such problems in the methylation process.
The stress response
Stress, particularly chronic stress, is one of the biggest factors affecting our health. Every person meets different stressors — physical, emotional, mental. When we are under stress the body responds through complex biochemical processes, and methylation is one of the fundamental ones, playing a key role in how the body regulates the stress response. Under stress the body produces hormones such as cortisol and adrenaline. These hormones need to be broken down and eliminated quickly once the stressful situation passes, so that balance is restored.
What happens during stress
Under stress the body activates the "fight or flight" response, controlled by the nervous and endocrine systems. This includes the release of adrenaline and cortisol, which prepare the body to cope — raising heart rate and blood pressure, releasing glucose into the blood for quick energy, and so on.
Methylation takes part in regulating the hormones and neurotransmitters responsible for this response:
- Synthesis and breakdown of stress hormones. Methylation takes part in the synthesis of hormones such as adrenaline and cortisol. More importantly, it also helps deactivate and eliminate them once they have done their job. If this process does not run properly, the body can remain in a state of chronic stress, because the hormones stay circulating in the blood for too long.
- Methylation and serotonin. Stress often affects serotonin levels — the neurotransmitter known for regulating mood. Methylation takes part in the synthesis of serotonin and in its breakdown when it is no longer needed. A disturbed methylation process can lead to a fall in serotonin, which is linked to depression, anxiety and other emotional problems.
If methylation is disturbed, the body will not deal effectively with stress hormones. This leads to prolonged stress levels, which over time can exhaust the body's resources and lead to chronic stress — itself linked to many conditions, such as heart problems, high blood pressure, immune problems and mental disorders including depression and anxiety.
In summary
Methylation is a fundamental biochemical process that plays a central role both in the regeneration of cells and tissue and in the regulation of the immune response.
- In regeneration, methylation ensures effective DNA repair, supports stem cell function and counteracts ageing. It regulates which genes will be active, which is key to the renewal of cells and their specialisation in different tissues.
- In the immune system, methylation controls the activity of immune cells, regulates inflammatory processes and helps prevent autoimmune disease. It ensures balance in the immune response, so the body can defend itself effectively without damaging its own tissue.
When methylation is disturbed, the consequences are serious — from accelerated ageing and slowed regeneration to a raised risk of chronic disease, infection and autoimmune problems. This is why it is vital to maintain an optimal methylation process.
Blood tests that assess methylation
There are specific blood tests that assess the state of methylation and its markers, such as homocysteine, folic acid and vitamin B12:
- Homocysteine test — a marker of methylation; high levels indicate a risk of cardiovascular disease.
- Folic acid (B9) test — a lack of this vitamin disturbs methylation.
- Vitamin B12 test — needed for the methylation cycle to work properly.
- Genetic tests for MTHFR gene mutations — mutations in this gene can affect the ability to metabolise folic acid.
- Methylmalonic acid (MMA) test — an indicator of vitamin B12 deficiency.
- SAMe and SAH tests — measure methylation status directly.
- Methylfolate test — the active form of folic acid the body uses in methylation.
Supporting methylation in the body
If tests show a disturbance, biochemical therapy may include supplements such as folic acid, vitamin B12 and trimethylglycine. In the case of over-methylation, therapy may include niacin and minerals such as magnesium and zinc to reduce the effects of excess methyl groups.
Under-methylation
Under-methylation is characterised by insufficient levels of methyl groups, which can lead to raised homocysteine and to symptoms such as fatigue, anxiety, depression and chronic inflammation. To correct it:
- Folic acid (in its active form, methylfolate) — activating folic acid helps methylation work better.
- Vitamin B12 (methylcobalamin) — takes part in converting homocysteine into methionine, lowering homocysteine and supporting methylation. See also the forms of vitamin B12.
- Vitamin B6 (pyridoxal-5-phosphate) — also takes part in breaking down homocysteine.
- Trimethylglycine (TMG) — a methyl donor that supports methylation and regulates homocysteine levels.
- SAMe (S-adenosylmethionine) — a direct methyl donor that supports the methylation of important molecules in cells.
Over-methylation
Over-methylation can cause irritability, restlessness, hyperactivity and sometimes aggressive behaviour. To correct this imbalance:
- Niacin (vitamin B3) — used to reduce over-methylation, since niacin binds excess methyl groups.
- Minerals such as magnesium and zinc — they help regulate the nervous system and reduce the effects of over-methylation.
- Folic acid and B12 in lower doses — used carefully, since they can accelerate methylation.
A B-complex is the usual way of covering the B vitamins involved in the cycle.
Eating for optimal methylation
Foods that support methylation include leafy green vegetables, fish, nuts and cruciferous vegetables. They provide the nutrients needed to maintain the balance of methyl groups in the body.
In conclusion, proper methylation is essential for maintaining good health and preventing chronic disease.
This article is informational and does not replace consultation with a doctor. Methylation status is assessed by tests, and supplement doses are determined by a specialist.
