Re: my son has abnormally large bowel movements
I diagree. I really don't think that her son's problem is constipation due to "holding it in." I guess it could be due to an enlarged colon, but from what she said, it doesn't sound like he is constipated. Constantly clogging up the toilet with a lot of matter isn't normal.
I think he needs to see a doctor for testing. We really don't have enough information, like what he eats, how much, how often he goes, any other symptoms. He could have a malabsorption issue or, who knows?
Although it's embarrassing for him and you, maybe you can address this now, help him to see the proper doctors, and hopefully save him from problems in the future. Find out exactly what his symptoms are and have him keep a journal for a few weeks, listing what he eats and how often he has a bm and how large it is. Then bring that information to the doctor, if it seems abnormal.
Try to ensure he's drinking plenty of water and eating a high fiber diet.