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Dietary supplements are used by at least 40% of athletes, and depending on the sport, up to 100%. Often multiple supplements are taken in higher than normal doses. Both competitive and recreational athletes take supplements, though sometimes for different reasons. Some take them to support a poor quality diet; others take supplements because they simply feel that an ordinary diet, even a good one, is unable to provide the necessary nutrients in adequate quantity. Female endurance athletes frequently supplement their diet with extra iron, with natural losses exacerbated by hard training, menses and often a low intake of iron-rich red meat. Nutritionists and dieticians usually recommend whole food solutions to these and other problems first, but some are now starting to accept the use of low dose vitamin and mineral supplements as a way to prevent deficiencies.
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