Define two types of vitamin B12 deficiency. Identify the DRI for vitamin B12 for older adults and list three good food sources
The two types of vitamin B12 deficiency are:
1) Pernicious anemia: macrocytic megaloblastic anemia, due to lack of intrinsic factor being released from the stomach cell wall.
2) Atrophic gastritis: prolonged inflammation, followed by the atrophied stomach mucosa secreting less acid.
The DRI for adults of all ages is 2.4 mcg/day. Good sources include eggs, milk, cheese, milk products, meat, fish, shellfish and poultry.
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a. more than twice as high as anyone needs b. the minimum amounts that average people need c. designed to be adequate for almost all healthy people d. designed to prevent deficiency disease in half the population
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