Vitamin B12 is found almost exclusively in animal foods — which makes it a genuine blind spot in a country with one of the world's largest vegetarian populations. Deficiency is common, often silent, and occasionally causes damage that doesn't fully reverse. It deserves more attention than it gets.
Why vegetarians are vulnerable
B12 is made by bacteria and reaches us through meat, fish, eggs and dairy. Strict vegetarians and vegans get very little from food, and even lacto-vegetarians often fall short because dairy alone rarely supplies enough.
Indian studies have long documented high rates of low B12, and researchers have flagged it as a widespread public-health issue in vegetarian communities.
The symptoms are sneaky
B12 is essential for red blood cells and the nervous system, so deficiency can look like anaemia, or like a neurological problem, or both.
- Tiredness, breathlessness and pallor from anaemia.
- Tingling or numbness in the hands and feet.
- Poor memory, brain fog or low mood.
- A sore, smooth tongue and mouth ulcers.
- Balance problems in more advanced cases.
The pregnancy connection
There is an important intergenerational angle. Work from the Pune Maternal Nutrition Study linked low maternal B12 (alongside adequate folate) to higher insulin resistance in children — a reminder that a mother's B12 status can shape her child's future metabolic health.
For women planning pregnancy, checking and correcting B12 beforehand is a small step with outsized value.
Staying covered
Because nerve damage from prolonged deficiency may not fully reverse, prevention beats cure. Testing is straightforward, and correction is inexpensive.
- Include dairy and eggs generously if you're vegetarian; fish and meat if you're not.
- Consider fortified foods or a B12 supplement, especially for vegans.
- Ask for a B12 test if you have unexplained fatigue or tingling.
- Correct a confirmed deficiency with supplements or injections as advised.
Key takeaways
- 01B12 comes almost entirely from animal foods, so vegetarians are at real risk.
- 02Deficiency can cause both anaemia and nerve symptoms — and nerve damage may not fully reverse.
- 03Low maternal B12 is linked to insulin resistance in the next generation.
- 04Test if in doubt; correct with fortified foods, supplements or injections.
References
- 1.Antony AC. Vegetarianism and vitamin B-12 (cobalamin) deficiency. American Journal of Clinical Nutrition, 2003.
- 2.Yajnik CS, Deshpande SS, et al. Vitamin B12 and folate concentrations during pregnancy and insulin resistance in the offspring: the Pune Maternal Nutrition Study. Diabetologia, 2008.
- 3.Allen LH. How common is vitamin B-12 deficiency?. American Journal of Clinical Nutrition, 2009.
This article is for general information and is not a substitute for personalised medical advice. Always consult a qualified clinician about your own health.
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