It absolutely correlates. Its one of the hardest things for me to accept. I remember waking up after my J-pouch surgery, when they took my colon, and I felt completely different. I couldn't really access the "joy" I used to feel. I'm on meds for depression and anxiety and they do help. I've also seen a therapist who specializes in PTSD due to chronic illness & pain for the past 13 years and I've learned coping mechanisms. But gut health and mental health are intrinsically linked due to how much serotonin is made in the "guts". I think there should be much more awareness around this subject. I am proud that I realized that I needed help and I actively seek it out. I wish more of us were aware of the direct link as it may reduce the stigma they feel.