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My mother has told that if your organism needs a vitamin, you want fruits include that vitamin. For example you have lack of C-vitamin you would like to eat lemon. Is there any explanation for it, or just it is a myth? The human organism knows that what we have to eat?

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    $\begingroup$ Probably organism not organisation $\endgroup$ – Mithoron Feb 26 '15 at 15:47
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    $\begingroup$ @ChrisStronks Please don't recommend Skeptics unless you explain the requirements of the site. Especially the notability rules, which otherwise tend to get most questions by new users closed. $\endgroup$ – Mad Scientist Feb 26 '15 at 23:08
  • $\begingroup$ @MadScientist - I have removed my comments. What are notability rules? And which requirements do you mean? those from Bio.SE or Skeptics.SE? $\endgroup$ – AliceD Feb 26 '15 at 23:19
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Assuming you mean organism, not organisation, it's not entirely false that cravings can be driven by deficiencies. In the case of the eating disorder pica, where a person eats non-food items like dirt and clay, can be caused by iron deficiency (Source). However, that article also suggests the possibility that pica causes iron deficiency by causing the person to eat items that lower iron absorption. So, my answer to your question is, maybe.

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