The relationship between nutrition and PSC is complex and little is known about it. Diet may have an impact on PSC and/or Ulcerative Colitis (UC), but this has not been well established. Researchers led by by PI investigator Joshua Korzenik, MD at Brigham and Women’s Hospital would like to learn more about the relationship between diet, PSC and UC. Registry participants will be notified if they are eligible for this study which consists of two online surveys.