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This review examines Mn intake by way of the food supply and poses the question: Is there reason to be concerned with Mn toxicity or deficiency in free\u2010living populations in North America? Although much remains to be learned of the functions of Mn, at present there are only a few vaguely described cases of Mn deficiency in the medical literature. Given the heterogeneity of the North American food supply, it is difficult to see the possibility of more than greatly isolated and unique instances of Mn deficiency. However, low Mn\u2010dependent superoxide dismutase activity may be associated with cancer susceptibility, and deserves further study. There may be reasons, however, to be concerned about Mn toxicity under some very specialized conditions. Increasing numbers of young people are adopting a vegetarian lifestyle which may greatly increase Mn intake. Iron deficiency may increase Mn absorption and further increase the body\u2010burden of Mn, especially in vegetarians. Mn is eliminated primarily through the bile, and hepatic dysfunction could depress Mn excretion and further contribute to the body burden. Would such a combination of events predispose substantial numbers of people to chronic Mn toxicity? At present, there is no definite proof of this occurring, but given the state of knowledge at the present time, more studies with longer time\u2010frames and more sensitive methods of analysis are needed.<\/jats:p>","DOI":"10.1002\/biof.5520100102","type":"journal-article","created":{"date-parts":[[2008,12,19]],"date-time":"2008-12-19T00:22:11Z","timestamp":1229646131000},"page":"15-24","source":"Crossref","is-referenced-by-count":115,"title":["Manganese deficiency and toxicity: Are high or low dietary amounts of manganese cause for concern?"],"prefix":"10.1002","volume":"10","author":[{"given":"John Weldon","family":"Finley","sequence":"first","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Cindy D.","family":"Davis","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"311","published-online":{"date-parts":[[2008,12,16]]},"reference":[{"key":"e_1_2_1_2_2","volume-title":"Recommended Dietary Allowances","author":"National Research Council","year":"1989"},{"key":"e_1_2_1_3_2","doi-asserted-by":"publisher","DOI":"10.1001\/archneur.1974.00490310061010"},{"key":"e_1_2_1_4_2","first-page":"253","volume-title":"Risk Assessment of Essential Elements","author":"Velazquez S.","year":"1994"},{"key":"e_1_2_1_5_2","doi-asserted-by":"publisher","DOI":"10.1007\/978-1-4684-4775-0_5"},{"key":"e_1_2_1_6_2","doi-asserted-by":"publisher","DOI":"10.1212\/WNL.44.9.1583"},{"key":"e_1_2_1_7_2","doi-asserted-by":"publisher","DOI":"10.1212\/WNL.17.2.128"},{"key":"e_1_2_1_8_2","doi-asserted-by":"publisher","DOI":"10.1016\/0014-4886(89)90157-X"},{"key":"e_1_2_1_9_2","doi-asserted-by":"publisher","DOI":"10.1080\/00039896.1989.9935883"},{"key":"e_1_2_1_10_2","doi-asserted-by":"publisher","DOI":"10.1212\/WNL.27.3.213"},{"key":"e_1_2_1_11_2","volume-title":"Toxicological Profile for Manganese","author":"US Department of Health and Human Services","year":"1997"},{"key":"e_1_2_1_12_2","doi-asserted-by":"publisher","DOI":"10.1093\/jn\/128.2.368S"},{"key":"e_1_2_1_13_2","doi-asserted-by":"publisher","DOI":"10.1093\/ajcn\/59.5.1223S"},{"key":"e_1_2_1_14_2","doi-asserted-by":"publisher","DOI":"10.1093\/ajcn\/55.3.747"},{"key":"e_1_2_1_15_2","unstructured":"J. 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