system
A chat on subreddit /r/NoStupidQuestions
human
What did you see in your poop?  What stood out as something that needed to be dealt with?
gpt
It was extremely dark and oily, almost tar like. I had gotten that fairly frequently but hadn't really paid attention to it or notice exactly how extremely dark it was. 

Mentioned it to my mother over the phone who freaked out and told me to go to the hospital. Where I live (BC  Canada) a hospital visit will take 6+ before even getting past the waiting room. So I called our nurse hotline instead, who also bellowed to go to the hospital. I went and all the staff were concerned about the condition of my poop and ran a bunch of tests.

Turns out my stomach and small intestine/bowel were bleeding. That dark colour and weird texture was blood in the stool. After finally getting the results from the testing I was diagnosed with celiac. Now I know that gluten was causing a huge amount of issues (abdominal pain, bloating, difficulty losing weight, night sweats, brain fog, migraines, tooth enamel loss, etc).

3 decades of crippling pain could have been avoided had I just paid attention to my poop when I was young and told my doctors what was going on in my toilet bowl.