What causes a personality to lose B-12 from their body?

My doctor did a blood test on me and said I have low B-12 and told me to get B-12 supplements from the store. What cause a person to lose this?
Answers:

Was it my length or just spotting?

The most adjectives cause of a loss of B-12 is not getting adequate of it in your diet. This is conspicuously true in vegans since B-12 is found in meat, fish, poultry, eggs and dairy products.

Another cause is the loss of parietal cell in the facing of the stomach. These cells assist the body to absorb B-12. The body's immune system may attack these parietal cell. The reason is unknown. This can organize to pernicious anemia.

Other causes are:
crohn's disease
celiac disease
some medication

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