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He had pernicious anemia at age 49 years.
Some people have a medical problem called pernicious anemia in which vitamin B 12 is not absorbed from the intestine.
It also prevents pernicious anemia and is necessary to a healthy nervous system.
If you have time, I have pernicious anemia and wondered if you had any information on.. .
Vegans, who do not consume any animal products, can be at risk for a lack of vitamin B12 even if they don't suffer from pernicious anemia.