I would recommend asking your doctor or the main nutritionist James Collier in the Huel forums or via email. However, there have been posts declaring that Huel is safe to take for the following. Diabetes, type 1 and 2. Crohn's disease. Recommended to limit Huel intake due to the high fiber content. Chronic gastritis. Ulcerative Colitis. Gerd. Chronic Fatigue. Mast Cell Disease.