Beeturia

[4] The red color seen in beeturia is caused by the presence of unmetabolized betalain pigments such as betanin in beetroot passed through the body.

[2] Betalains are oxidation-sensitive redox indicators that are decolorized by hydrochloric acid, ferric ions, and colonic bacteria preparations.

[1] The incidence of beeturia increases in people with pernicious anemia and iron deficiency.

[3] There is no known direct genetic influence, and no single gene variant, that differentiates excreters from non-excreters.

[1][2][3] The presence of beet pigment-protecting substances, such as oxalic acid, in the meal and during intestinal passage, increase the color intensity in the urine.