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I assume a healthy human, with usual nutrition, without using any drugs or supplements.

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  • $\begingroup$ I find this question difficult for several reasons. You assume "normal" nutrition - what is normal? A meal with spinach gives different colour than beetroot stew. I assume, this is about healthy human (since blood in stool can result in dark colour). And how would a proper answer look like - providing a colour hex code, or similar? $\endgroup$ – Arsak Apr 17 '19 at 11:27
  • $\begingroup$ Yeah, it's difficult. For me, ideally, a good answer should contain a colour hex code and the type(s) of nutrition responsible for the dark colour. $\endgroup$ – user51164 Apr 17 '19 at 11:40
  • $\begingroup$ Unless you define what normal is, your question would be considered opinion based and hence put on hold. $\endgroup$ – WYSIWYG Apr 17 '19 at 11:45
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    $\begingroup$ You can say in a healthy human, with usual nutrition, without using any drugs or supplements...and put this in your question. $\endgroup$ – Jan Apr 17 '19 at 12:46
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    $\begingroup$ @MichaelBauer then can you please edit your question to add all the necessary details. $\endgroup$ – WYSIWYG Apr 17 '19 at 13:11
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The darkest stool in a healthy human is black. It can result from eating black licorice, blueberries, blood sausages, Oreo cookies or grape juice.

Other foods that may cause almost black stools: dark chocolate, beets, cranberries, prunes, dark green leafy vegetables, such as spinach or kale.

They are not nutrients, but natural or artificial dyes in the food, that can turn stool black.

Black, tarry and smelly stool is suspicious for bleeding from the upper gastrointestinal stomach (from mouth to stomach), since the acid in the stomach turns blood black.

Sources: (Medline Plus, OU Medicine, 25Doctors.com)

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