Before a colonoscopy, it is typically recommended to follow a clear liquid diet to ensure the bowel is fully empty for the procedure. Solid foods are generally avoided. Clear liquids may include water, clear broth, tea, coffee (without milk or creamer), clear fruit juices (without pulp), and gelatin. Patients are usually instructed to stop eating solid foods at least a day before the colonoscopy and to avoid any red or purple liquids as they can interfere with the procedure. The clear liquid diet helps keep the digestive tract clean and allows the doctor to have a clear view during the colonoscopy. Specific instructions may vary based on the healthcare provider's recommendations. For the day before a colonoscopy, typical allowable foods and drinks might be:

• Water
• Clear broths or bouillon
• Clear fruit juices without pulp (apple, white grape)
• Tea or coffee without milk or creamer
• Gelatin (without red or purple coloring)
• Popsicles (without red or purple coloring)

Solid foods and high-fiber foods are avoided before the procedure to ensure the colon is clean. It is essential to carefully follow the preparation instructions given by the healthcare provider for successful colonoscopy results.