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The betalain in beetroots might cause your feces to darken.
Beetroots are a type of root vegetable that is distinguished by their rich, dark red color. This color is caused by the presence of betalain, a red pigment that is responsible for the vegetable's bright coloring. This same pigment, however, might cause your feces to become black after ingesting beetroots. This is due to the fact that betalain does not break down in the digestive system and instead travels through the body and is expelled in the stool.