since I don't see PB4 response I may be repeating what they said. Everyone is very different. It could have even been what he had to eat the day before. I would no worry about it. They can ,excuse the wording, suck out anything that they feel needs to go. I think the main thing is to start early. Most of my friends and I tend to start it a little earlier than they say. My system is very slow. There just isn't any way to be sure but eating light a few days before will help i am sure.