The content of natural pigments in pitaya is very high, some natural pigments are not absorbed and decomposed, and these pigments are water-soluble, so the excrement is dyed red after being excreted in urine and feces.

If pitaya is only eaten once, and the urine is still red after a whole day or a few days, we should be careful of the possibility of hematuria, which is usually related to stones, trauma, inflammatory infection, tumors and so on. It is recommended to go to the hospital to check the urine routine in time.

Extended data:

Pitaya is red in color and rich in nutrition. Pitaya is sweet and flat. Its main nutritional components are protein, dietary fiber, vitamin B2, vitamin B3, vitamin C, iron, phosphorus, calcium, magnesium and potassium.

It is rich in pulp fiber, carotene, vitamins B 1, B2, B3, B 12, C and so on. This stone (the seed of black sesame) is rich in minerals, such as calcium, phosphorus, iron, various enzymes, albumin, fiber and high concentration of natural pigment anthocyanin.

Baidu Encyclopedia-Red Heart Pitaya

People's Daily Online-The woman ate a few red pitaya, and the urine turned pink the next day.