Hi, the prevalence of CSID has been reported to be around 0.2 %. Sucrase Isomaltase Deficiency (CSID) is a congenital disorder characterized by abdominal pain, cramps and fermentative diarrhea after eating. Dietary treatment for CSID is based on sucrose, isomaltose, and maltose restriction. The degree of restriction is patient-specific. You can try to reach patient support groups, they could provide an input for your condition. Regards.
My daughter was recently diagnosed with CSID and I found a very helpful support group through Facebook (CSID Parents & Patients). I have already learned so much from feedback from the group when I have questions, etc. Hope this helps!