Last week I tried out eating Pak-Choy for the first time. During the night after that, I had diarrhea. The day after, I ate it again. Same thing. The day after that, I stopped eating Pak-Choy. I still had diarrhea during the night. The day after that it stopped. I thought it was food poisoning from the Pak-Choy, but we're a week later, and I got severe diarrhea again. I didn't change anything to my diet, except for one thing : I drink 2 cups of Pau d'Arco tea instead of 1, and I drink one of them late at night (before going to bed).