The condition needs to be treated “as soon as possible” as it can cause “irreversible” and “permanent” damage.
Fortunately, the condition can be picked up through a simple blood test.
Dr Mahmood said: “To prevent a vitamin B12 deficiency, make sure that you’re eating a healthy, balanced diet or consider taking vitamin B12 supplements.
“Many animal foods – eggs, fish, meat and poultry – contain vitamin B12. Some fortified breakfast cereals are also a good source.”
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