Hello! My Question: I Have A Son Who Is 21

Hello! My question: I have a son who is 21 yrs old. His bowels has always moved really well when he would eat he would have to go to the bathroom soon after. Well here lately he has to take a bathroom break even before we get up from the table. No matter what we are eating. He does not seem to have stomach pain , or does it stop him from eating. I was wondering if this is something I should be worried about? I was thinking about getting him a appointment with our family doctor but he is fighting me so I thought I would do some research on my own. Thank you.