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Bengaluru: Anxiety is commonly associated with stress and mental health conditions, but nutritional deficiencies can sometimes contribute to symptoms that resemble anxiety. Vitamin B12 is one such nutrient, with deficiency linked to neurological, cognitive and mood- problems.

Vitamin B12, also known as cobalamin, is essential for normal nerve function, red blood cell production, DNA synthesis and brain health. When levels become too low, some people may experience fatigue, irritability, difficulty concentrating, dizziness or neurological symptoms that can overlap with anxiety or panic.

However, vitamin B12 deficiency should not be assumed to be the cause of anxiety in every person. Anxiety has multiple possible causes, and the relationship between B12 status and mental health can vary depending on the individual and the severity of the deficiency.

How vitamin B12 supports the body

Vitamin B12 plays several important roles in the body. It helps maintain healthy nerve cells and contributes to the production of myelin, the protective covering surrounding nerve fibres.

Healthy myelin allows electrical signals to travel efficiently through the nervous system. A prolonged deficiency can therefore affect the brain and peripheral nerves, resulting in symptoms such as tingling, numbness, balance problems and cognitive changes.

B12 is also involved in the formation of red blood cells. Severe deficiency can lead to megaloblastic anaemia, which may cause fatigue, weakness, pale skin, breathlessness and dizziness.

The nutrient is also involved in DNA synthesis and several metabolic reactions that are important for normal neurological function.

Can low B12 contribute to anxiety?

There is evidence linking vitamin B12 deficiency with neurological and psychiatric manifestations, although this does not mean that every case of anxiety is caused by inadequate B12.

B12 participates in metabolic pathways involved in the production and regulation of substances important to brain function. Deficiency can also affect homocysteine metabolism and other biochemical processes associated with neurological health.

As a result, some people with a significant deficiency may experience mood changes, irritability, low mood, confusion or symptoms that feel similar to anxiety.

Fatigue and cognitive difficulties can further make a person feel mentally overwhelmed. When these symptoms occur alongside palpitations, dizziness or tingling sensations, they may sometimes be mistaken for symptoms of a panic attack.

Symptoms that can overlap with anxiety

One reason B12 deficiency can be difficult to recognise is that some of its symptoms overlap with those experienced during anxiety.

Fatigue and brain fog

Low B12 can cause persistent tiredness and weakness, particularly when deficiency has contributed to anaemia. Some people may also experience difficulty concentrating or what is commonly described as brain fog.

These symptoms can affect daily functioning and may contribute to feelings of nervousness or distress.

Tingling and numbness

Vitamin B12 deficiency can affect the nervous system and cause tingling or numbness, particularly in the hands and feet.

Such sensations may be alarming, especially when their cause is not immediately apparent.

Dizziness and palpitations

Dizziness and a racing or noticeable heartbeat can occur in a variety of conditions, including anxiety and anaemia associated with nutritional deficiency.

Because these symptoms are not specific to B12 deficiency, medical assessment is important rather than assuming that anxiety or a vitamin deficiency is responsible.

Mood changes

Some people with B12 deficiency can experience irritability, low mood, difficulty concentrating and other changes in mental functioning.

In severe cases, neurological and psychiatric manifestations can become more pronounced.

Other signs of vitamin B12 deficiency

A deficiency can produce both physical and neurological symptoms.

Physical signs may include:

• Persistent fatigue
• Weakness
• Pale skin
• Breathlessness
• Dizziness

Neurological symptoms may include:

• Tingling or numbness in the hands and feet
• Balance difficulties
• Memory problems
• Difficulty concentrating
• Brain fog

Mental and behavioural changes can include:

• Irritability
• Mood changes
• Low mood
• Anxiety-like symptoms
• Difficulty concentrating

Not everyone with B12 deficiency experiences all of these symptoms. Some people may develop neurological problems even without obvious anaemia.

Who is more vulnerable to B12 deficiency?

Certain groups have a higher risk of developing inadequate B12 levels.

People following strict vegan diets may be particularly vulnerable because naturally occurring vitamin B12 is found predominantly in animal-derived foods. Fortified foods and appropriate supplements can provide alternatives.

Older adults can also be at greater risk because the ability to absorb B12 from food may decline with age.

People with certain digestive conditions can have difficulty absorbing the vitamin even when their diet contains adequate amounts.

Some medicines can also affect B12 status. People taking medicines such as metformin or proton pump inhibitors for extended periods may need to discuss their B12 status with their doctor.

Foods that provide vitamin B12

Vitamin B12 is naturally present mainly in animal-derived foods. Dietary sources include fish and seafood, eggs, milk and other dairy products, poultry and meat.

People who avoid animal products can obtain B12 through fortified foods or supplements, depending on their individual nutritional requirements.

However, people should not begin high-dose supplementation solely because they are experiencing anxiety. If deficiency is suspected, testing and medical advice can help determine whether supplementation is actually required.

Can treating B12 deficiency reduce anxiety?

Correcting a genuine vitamin B12 deficiency is important for preventing or treating deficiency- complications. If anxiety-like symptoms are being contributed to by an underlying deficiency, treating that deficiency may help improve the associated symptoms.

However, supplementation is unlikely to provide a meaningful anxiety benefit in someone who already has adequate B12 levels.

This distinction is important because anxiety can have numerous causes, including psychological stress, sleep problems, other medical conditions and environmental factors.

Therefore, taking B12 supplements without establishing a deficiency should not be considered a universal treatment for anxiety.

When should B12 levels be checked?

People experiencing persistent or unexplained symptoms such as anxiety along with fatigue, tingling, memory difficulties, dizziness or balance problems may discuss B12 testing with a healthcare professional.

Testing can help determine whether a deficiency is present and whether further investigation is needed to identify its cause.

People following long-term vegetarian or vegan diets, older adults and those with conditions or medications that can interfere with B12 absorption may also benefit from discussing their B12 status with a doctor.

It is particularly important not to ignore neurological symptoms. Prolonged B12 deficiency can cause nerve- complications, and early identification can help prevent further problems.

The bottom line

Vitamin B12 deficiency can affect the nervous system and brain and may produce symptoms that overlap with anxiety, including fatigue, dizziness, irritability, concentration difficulties and unusual sensations.

However, B12 deficiency is only one possible contributor to anxiety-like symptoms. Anxiety should not automatically be attributed to a nutritional deficiency, and supplementation is not necessarily beneficial when B12 levels are already normal.

Anyone experiencing persistent anxiety together with unexplained physical or neurological symptoms should seek medical evaluation. Identifying the underlying cause is more important than treating the symptoms with supplements alone.