Vegetarians have a high prevalence of depleted iron stores. ![]() Serum ferritin was lower in male vegetarians than male nonvegetarians in each study (11% among vegans and 21% among vegetarians compared to 6% and 7% among high and moderate meat consumers, 3% of vegetarians, and 25% vegans vs 0% of nonvegetarians, 29% vs 7%, 9% vs 0%). A higher percentage of vegetarian females, compared to nonvegetarian participants, had ferritin below deficiency cutoff in all but one study (34% vs 0%, 47% vs 42%, 18% vs 13%, 27.8% vs 6.5% among Catholic nuns and 19.4% among college students, 79% Indian, and 56% Caucasian vegetarian vs 27% of nonvegetarian). The prevalence of hemoglobin below deficiency cutoff ranged from 0% to 15.3%. Among males, the range of ferritin <12 µg/L across studies was from 1.7% to 29%. An inadequate hemoglobin concentration ranged from 6% to 30.3%. ![]() Among female vegetarians, the percentage of the sample with ferritin <12 µg/L or <12 ng/mL ranged from 12% to 79%. Thirteen original articles met the inclusion criteria. The goal of this study was to review published data on iron status among vegetarian adults.
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