What's wrong with eating red pitaya and urinating red?

After eating red pitaya, the red color of urine may be related to the betanin component in pitaya.

Red pitaya contains more betanin, which is a kind of natural pigment. It is usually not easy to be completely decomposed by the human body. After eating red pitaya, the undecomposed betanin will be metabolized by the kidneys and excreted with urine. Affected by its staining, it may cause urine redness, which is usually a normal physiological phenomenon. However, if the urine turns red after eating red pitaya, accompanied by frequent urination, urgency, pain and other symptoms, it may be related to cystitis, urinary tract infection and other diseases.