The clinic I go to is pressuring me to have a colonoscopy simply because I am over 50 and "everyone does it". I'm worried not just about going low, but about the prep damaging my kidneys. 6 years ago I had a horrific experience with breast cancer screening (false positive led to 2 biopsies in which the anesthetic kicked in hours after the procedure causing extreme pain and emotional trauma). I no longer do mammograms as a result. Clinic has new equipment$$. Being told "You will die a horrible death from cancer if you don't have the screening" does not help, but rather strengthens my resolve not to entrust my health to them.
Additional discussions on colonoscopy and diabetes: