Yes, I've had the same problem since being diagnosed and also wondered if there was a connection.
Female, age 43
Diagnosed with Ulcerative Colitis 2/2007
In remission since 7/2007
9 Asacol daily
Rowasa 1x weekly
Fish oil, multi-vitamin, B complex, Mag Oxide, Calcium, Vit C, Vit E, Multi-vit