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Your brain logs it as a threat

This is particularly important if you also feel unwell or have a high temperature

[6] If this happens, vitamin B 12 deficiency may result in sense loss, loss of sensation in the feet, difficulty walking, poor balance, blurred vision, changes in reflexes, muscle weakness, decreased smell and taste, decreased level of consciousness, mood changes, memory loss, depression, irritability, clumsiness, disorientation, dementia and, in severe cases, psychosis

Cell Signal

However, vitamin B 12 deficiency does not generally develop until after at least two-to-three years of continuous therapy (137-139)