When I had my colonoscopy the doctor said that I should stop eating and begin fasting 24 hours prior to the colonoscopy procedure.
Fasting for 24 hours prior to the colonoscopy helps clean your colon out which is necessary to have a successful colonoscopy.
All solid foods are off limits during the fasting for the colonoscopy but my doctor said that I can have clear liquids or even coffee.
But just avoid eating any foods 24 hours before the colonoscopy is done.
If you've never fasted before it can be hard to try to avoid foods but you need to do so if you want to have the colonoscopy test done without any issues.