The article at the following link clearly explains the details of how this can happen:
Food dyes may cause disease when the immune system is dysregulated, researchers report
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New research shows how artificial food dyes can cause IBDs
Moderators: Rosie, Jean, CAMary, moremuscle, JFR, Dee, xet, Peggy, Matthew, Gabes-Apg, grannyh, Gloria, Mars, starfire, Polly, Joefnh, mbeezie
New research shows how artificial food dyes can cause IBDs
It is suspected that some of the hardest material known to science can be found in the skulls of GI specialists who insist that diet has nothing to do with the treatment of microscopic colitis.