The subjects should eat red pitaya. I think the question can be changed. Not only children will pee red after eating it, but also adults will. I have encountered this problem. I know a foreign friend who came to Yunnan to travel and ate red pitaya. When he went to the toilet the next morning, he found that his urine was red, and he immediately panicked. I didn't say that the red pitaya he ate was colored. I went to check the information and told him the reason, but he insisted on not believing it. He didn't say he asked other friends, and said that his friends also said it might be colored, so I got drunk. I hope that friend is not from China. Because the cost of adding pigment to red pitaya is much higher than that of not adding pigment, it is unnecessary.

The main reason for the discoloration of red pitaya after eating urine is that it contains betanin. After eating pitaya, the lycopene contained in it will not decompose, so it will be excreted with urine, so the urine is red. So after eating red pitaya, I found that my urine was red. Don't panic. It is normal. Drink plenty of water and speed up the discharge of beet pigment, and it will soon be normal.