A patient is being treated for the effects of a longstanding vitamin $\mathrm{B}_{12}$ deficiency. What aspect of the patients health history would most likely predispose her to this deficiency?

Question

Quizplus · Accepted Answer

Because vitamin $B_{12}$ is found only in foods of animal origin, strict vegetarians may ingest little vitamin $\mathrm{B}_{12}$. Irregular menstrual periods, marijuana use, and blood donation would not precipitate a vitamin $\mathrm{B}_{12}$ deficiency.

A Patient Is Being Treated for the Effects of a Longstanding