Fact or Myth: Only Vegans Get B12 Deficiency? Who Else Is at Risk
Vegans are not the only people who run low on vitamin B12. Several groups who eat meat can run low too. Verdict: Myth. Diet is one route to low B12, but poor absorption and some medicines can cause it as well, and they reach meat eaters too, which is the part most people miss. Eating meat is not a guarantee.
At a glance
- Quick answer: No.
- Verdict: Myth. Vegans are one group at risk, not the only one.
- What is true: Low B12 can come from diet, from poor absorption, or from certain medicines. A meat-rich diet rules out none of them.
- What to do instead: Give the doctor your full medicine list and your symptoms before asking for a B12 test.
- The short rule: Meat only helps if your stomach and gut can take the B12 out of it.
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Why do people think only vegans get B12 deficiency?
The belief has a real starting point. Vitamin B12 comes mainly from animal foods, with meat, poultry and fish the main sources and dairy and eggs in smaller amounts, so a diet without them can run short. The Linus Pauling Institute says strict vegetarian and vegan diets can result in deficiency, and the NHS lists a vegan diet with no B12 from vitamin pills or fortified foods as a cause. Diet matters, but it is not the whole story.
The belief breaks down at one step; it assumes that eating B12 is the same as getting B12. It is not. The body needs a working stomach and gut to take the vitamin out of food; when that step fails, a steak or a plate of eggs cannot fix the shortage on its own. Look at the groups below. They matter as much as the menu.
Who else runs low on B12?
Several groups can run low while eating meat every day. Here are the ones the NHS and the Linus Pauling Institute name as causes.
- Older adults. Absorption of B12 from food declines with age. It is commonly impaired in people over 60.
- People on acid-reducing medicines. Acid-reducing medicines, including proton pump inhibitors, lower the stomach acid needed to release B12 from food. The NHS names proton pump inhibitors among the medicines that can reduce B12 levels.
- People taking metformin. Metformin was found to decrease how much B12 the body absorbs, and the NHS lists it among medicines that can reduce B12.
- People with pernicious anaemia. The NHS says pernicious anaemia is the most common cause of vitamin B12 deficiency in the UK.
- People who have had part of the stomach removed, or who have Crohn’s disease. Stomach surgery increases the risk of B12 deficiency, and Crohn’s disease can mean the body does not get enough.
The Linus Pauling Institute adds H. pylori infection, pancreatic problems, coeliac disease, alcohol dependence and HIV to the list of conditions linked to low B12. That is a long list. Plant-based protein is a separate question, and the soya chunks and tofu article covers that side.
What are the early signs of low B12?
Mild deficiency can cause no symptoms at all, and blood markers may already point to a problem. When symptoms do appear, the NHS lists feeling weak or tired, numbness, pins and needles, a sore or red tongue sometimes with mouth ulcers, and problems with memory or mood. The Linus Pauling Institute also mentions difficulty walking, appetite loss and constipation. Numbness and tingling more commonly affect the feet, so watch them first.
Numb feet have several possible causes. So the answer is a test and a proper conversation. It is not a guess. The article on burning feet at night covers the diabetes side.
Why can a normal-looking B12 result still miss the problem?
A normal-looking blood result does not always settle the question. The Linus Pauling Institute notes that there is no gold standard blood test for B12, and that clinical symptoms are important in diagnosis. A range of markers is used, sometimes in combination. Borderline results go to the doctor, who reads them alongside your symptoms and medicines, and the guide to B12 test reports and the borderline trap explains the numbers on the page.
The medicine list trick
Before any B12 test, write down every medicine you take. Include acid-reducers and metformin, along with any vitamin pills or fortified foods you use, and hand the list to the doctor with your symptoms. Paper works best. Never stop or change a medicine on your own to see whether it matters, because that decision belongs to the doctor.
What should you do if you are in one of these groups?
- Write down what you eat in a normal week, including any vegan days and whether you use vitamin pills or fortified foods.
- List every medicine you take, including acid-reducers and metformin, plus any stomach or bowel surgery you have had.
- Note your symptoms, such as tiredness, tingling, mouth soreness or memory and mood changes, and how long they have lasted.
- Ask your GP for a B12 test and a full talk about the result. Do not start or stop any medicine until a doctor has reviewed the list.
Numbness, pins and needles, or trouble walking do not settle; the same goes for memory changes, mood changes, a sore red tongue or unusual tiredness; if your feet are numb and you take metformin or acid-reducers, ask a doctor about a B12 test. Do not guess at the cause. Never stop a medicine on your own.
Myth: Only vegans get vitamin B12 deficiency
The correction is simple. Vegans are a real risk group, and so are older adults, people on some acid-reducing or diabetes medicines, and people whose gut takes in less B12 from food. A meat eater with one or more of those features can still run low. Read that twice.
Eating meat is not a shield on its own. The B12 in meat still has to be absorbed, and that depends on the stomach and gut as much as on the menu; so the better question is not only what you eat, but whether your body can take it in. Ask that one.
Diet is one cause of low B12. Absorption and medicines are others.
More guides on minerals and vitamins sit in the Vitamins and Minerals hub, and claims checked like this one are collected in the Fact or Myth hub.
Questions about B12 deficiency and who is at risk
Can meat eaters have vitamin B12 deficiency?
Yes. Meat eaters can run low when absorption is the problem, because the B12 in meat only helps if the stomach and gut can take it in. Older adults, people with pernicious anaemia and people on acid-reducing medicines are examples.
Is B12 deficiency only a vegan problem?
No. A vegan diet with no B12 from vitamin pills or fortified foods is one cause. Absorption problems and certain medicines affect people who eat meat too.
Who is at risk of B12 deficiency?
Older adults, people on acid-reducing medicines or metformin, people with pernicious anaemia, people who have had part of the stomach removed, and people with Crohn’s disease can all run low. Vegans without a reliable B12 source belong on the list as well.
Does metformin lower vitamin B12?
Metformin was found to decrease how much B12 the body absorbs, and the NHS lists it among medicines that can reduce B12. Never stop metformin on your own. Ask the doctor about any B12 concern.
Can acid-reducing medicines cause low B12?
Yes. Acid-reducing medicines, including proton pump inhibitors, lower the stomach acid needed to release B12 from food. Tell your doctor before a B12 test, and do not stop the medicine without advice.
What are the early signs of low B12?
Tiredness, numbness, pins and needles, a sore red tongue and changes in memory or mood are among the signs the NHS lists. Numbness and tingling more commonly affect the feet. Mild deficiency can cause no symptoms at all.
Can numb feet mean low B12?
Possibly. Low B12 is one cause of numb feet, and other causes exist too. A doctor should check rather than guess, and a B12 test with the full medicine list is a sensible starting point.
Can a normal B12 result rule out a shortage?
Not always. There is no gold standard blood test for B12, and the Linus Pauling Institute notes that clinical symptoms are important in diagnosis. A doctor reads the result alongside symptoms and medicines.
What should a vegan do about B12?
Use a reliable source, such as fortified foods or vitamin pills; then ask a doctor or pharmacist which option suits you; this article does not rank products.