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The 7 WARNING Signs of a B12 Deficiency - Dr. Berg

author avatar Dr. Eric Berg 01/10/2025

Are you constantly tired, no matter how much sleep you get? Do you feel a tingling sensation in your hands and feet? Perhaps your thinking isn't as sharp as it used to be.

These could be vitamin B12 deficiency symptoms. This isn't something to take lightly. Left unchecked, it can lead to irreversible nerve damage. Let’s explore what you need to know about vitamin B12 deficiency symptoms.

Understanding B12: Why It Matters


Vitamin B12 is essential for many bodily functions, from DNA synthesis to nerve function. It plays a vital role in nerve function, creating the protective myelin coating around your nerves.

This coating helps impulses move efficiently. Vitamin B12 also plays a crucial role in making red blood cells, which carry oxygen throughout your body.

Vitamin B12 deficiency anemia disrupts these processes, leading to various symptoms.

Recognizing the Seven Key B12 Deficiency Symptoms


Vitamin B12 deficiency symptoms can vary. However, there are seven common signs you should be aware of. These symptoms often develop slowly, sometimes mimicking other health issues.

Early detection can make a huge difference in your overall well-being.

Young man with chronic fatigue

1. Fatigue

This isn't just everyday tiredness; it's persistent, overwhelming exhaustion that doesn't improve with rest. This fatigue can disrupt daily activities, making simple tasks feel monumental.

2. Neurological Symptoms

Vitamin B12 deficiency symptoms often manifest neurologically. Numbness or tingling in the hands and feet (paresthesia) is frequent. Vitamin B12 keeps your nerve endings and brain healthy. Other neurological symptoms can include balance and coordination issues, affecting even normal actions.

3. Psychological Symptoms

Vitamin B12 deficiency can affect your mood and cognitive function, causing confusion, brain fog, or mood swings. Adequate B12 levels are crucial for optimal brain cell function.

4. Vision Problems

In some cases, vitamin B12 deficiency leads to blurred or double vision and light sensitivity. B12 is essential for transporting and utilizing vitamins like vitamin A, which is crucial for healthy eyesight.

5. Weakness and Dizziness

Because vitamin B12 is involved in red blood cell production, deficiency can cause weakness and dizziness. This occurs because red blood cells carry oxygen to your body and brain. Reduced oxygen supply can lead to these symptoms.

6. Swollen or Inflamed Tongue (Glossitis)

Glossitis, a swollen or inflamed tongue, can be a symptom of deficiency anemia. It may appear painful and glossy.

7. Pale Skin and Jaundice

Pale skin and jaundice can also be indicators of vitamin B12 deficiency. Reduced red blood cell production and bilirubin buildup contribute to this yellowish appearance. Bilirubin is unable to process correctly with low Vitamin B12.

Why B12 Deficiency Happens


Vitamin B12 absorption is a complex process. Hydrochloric acid is required in your stomach to separate vitamin B12 from food. Intrinsic factors, produced by cells in the stomach lining, bind to B12 for absorption in the small intestine.

Problems arise if there's not enough hydrochloric acid or intrinsic factor, as seen in some autoimmune conditions like pernicious anemia.

B12 deficiency isn't usually about a lack of B12 in the diet but rather issues with the body absorbing vitamin B12.

People aged 60 or older commonly experience B12 deficiency. As we age, our bodies produce less stomach acid, hindering B12 absorption.

Conditions like Crohn’s disease and celiac disease also affect B12 absorption.

Diagnosing B12 Deficiency Symptoms

If you suspect a vitamin B12 deficiency, consult a healthcare provider. They can perform a blood test to measure your B12 levels and diagnose vitamin deficiency anemia if present.

Other tests may check your red blood cell count and size. Additional neurological exams can be helpful if neurological symptoms are present.

Talk to your doctor if you suspect a vitamin B12 deficiency, especially if you are aged 60 or older or follow a strict vegan diet. Deficiency can also occur after weight loss surgery or with conditions like peptic ulcers or gastric bypass.

Treating B12 Deficiency

Treatment for vitamin B12 deficiency depends on the cause. Injections or high-dose oral vitamin B12 supplements may be necessary if levels are critically low.

Dietary changes are essential, but addressing the underlying cause, such as malabsorption, is crucial for long-term management.

Talk to your doctor to determine the appropriate treatment based on your circumstances.

Vitamin B12 food sources

Foods Rich in B12

B12 is found mainly in animal products. Vegetarians and vegans can get B12 from fortified foods, nutritional yeast, and supplements.

Food

B12 Content (mcg per serving)

Beef Liver (3 oz)

70-80

Clams (3 oz)

14-99

Sardines (3 oz)

7-8

Beef (3 oz)

1-2.5

Salmon (3 oz)

2-3

Eggs (1 large)

0.5-0.6

Milk (1 cup)

0.9-1.2

Cheese (1 oz)

0.1-0.9

Fortified foods

Variable


The Role of Diet in Preventing B12 Deficiency


Vitamin B12 is essential for energy production, nerve health, and red blood cell formation. A deficiency in B12 can lead to symptoms like fatigue, brain fog, and tingling sensations.

Diet plays a significant role in maintaining adequate B12 levels, particularly for those following specialized eating plans.

When comparing keto vs paleo, both diets include animal-based foods, which are rich sources of B12, such as meat, fish, and eggs. However, strict adherence to either diet without variety can sometimes limit nutrient intake.

For those focusing on either keto or paleo, incorporating a diverse range of B12-rich foods or considering supplementation can help prevent deficiencies.

This approach ensures that dietary choices not only align with weight loss or health goals but also support long-term energy and neurological health.

Conclusion


B12 deficiency symptoms shouldn't be ignored. Early diagnosis and treatment are critical to preventing long-term health issues.

Proactive care, including regular blood tests and a proper diet, is essential for maintaining healthy B12 levels.

If you're experiencing unexplained fatigue or cognitive difficulties, consult a healthcare professional to rule out B12 or folate deficiency anemia.

Addressing these deficiencies can significantly improve your overall health and well-being.

Maintaining adequate B12 levels is vital for optimal health as we age. It can improve energy levels and overall well-being. Routine blood tests can help detect early signs of deficiency.

FAQs about B12 Deficiency Symptoms


What happens if your B12 is low for too long?

Long-term B12 deficiency can lead to severe and irreversible nerve damage, affecting mobility and cognitive function. Other complications include anemia, heart problems, and digestive issues.

Neurological symptoms can also become permanent if B12 levels remain low for extended periods. Deficiency can lead to a decline in overall health.

What are low B12 symptoms?

Common B12 deficiency symptoms include fatigue, weakness, numbness or tingling in the extremities, balance problems, and cognitive difficulties like confusion or memory loss.

Vision changes, a swollen tongue, pale skin, and jaundice are other potential signs.

Does B12 deficiency cause sleepiness?

B12 deficiency causes profound fatigue, which is not the same as sleepiness. Those with a B12 deficiency often feel exhausted but can't sleep well, indicating that sleep isn't restorative.

Other deficiencies, like niacin deficiency, can also affect sleep.

What is the fastest way to recover from B12 deficiency?

The fastest way to address a B12 deficiency is through B12 injections or high-dose oral supplements prescribed by a doctor.

While dietary changes are important, they may not be enough to quickly restore B12 levels in severe cases. Food sources are ineffective if the body can't absorb B12 properly.

Addressing the root cause, such as malabsorption, is crucial.

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