"Initially, I will need weekly injections of Vitamin B12 and then monthly injections for maintenance, which will be a lifelong regime." indicates that teaching was sucessful.
Vitamin B12 is an important vitamin required by the body. The deficiency of vitamin results in pernicious anemia. The deficiency of vitamin B12 due to lack of intrinsic factor indicates that body can not absorb the vitamin.
Therefore, whatever food the patient takes, will continue the deficiency. The only possible treatment is injecting the vitamin into body. Thus, the patients lacking intrinsic factor require lifelong injections of vitamin B12 for healthy life.
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