Vitamin B12 deficiency results either from inadequate dietary intake, such as in vegans who are not consuming vitamin B12-fortified foods or supplements, or from malabsorption.

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Vitamin B12 deficiency can occur due to inadequate dietary intake, especially in vegans who do not consume B12-fortified foods or supplements, or from malabsorption issues, where the body cannot properly absorb the vitamin from the consumed food.

Vitamin B12 Deficiency Results Either from Inadequate Dietary Intake, Such