Clear Liquid Diet

A clear liquid diet is a special diet that consists of clear fluids such as broth, plant gelatin, and water that are easily absorbed, leaving no undigested residues in the intestine.

Your physician may prescribe you a clear liquid diet before certain medical procedures(1) such as a colonoscopy study, or in certain GI tract diseases such as diverticulitis or esophageal disorders. Clear liquid diets are typically short-term diets and are rarely advised for more than a few days at a time.

Patients are not allowed to eat solid foods while on a clear liquid diet. Foods that melt partly or entirely at room temperature are called liquid foods. The general rule to qualify as a clear liquid food is one in which a newpaper or magazine can still be read when the liquid is held in front of it.

Purpose of clear liquid diet

A clear liquid diet is used before those medical procedures that require an empty stomach and intestines, such as colonoscopy(3).

Providers also prescribe it in certain digestive diseases such as diarrhea, vomiting, or after certain surgeries.

Special consideration

• Your provider will limit the intake of certain fluids and allow you to take specific fluids. You should strictly follow provider instructions.
• If you experience abdominal pain or cramping when on a clear liquid diet, contact your physician.
• If your provider prescribes you a clear liquid diet before a diagnostic test, you should strictly follow the instructions; otherwise, it can interfere with the results.
• You should avoid colored fluids before diagnostic procedures, such as red or purple-colored juices, as they can interfere with results.
• If you have diabetes, please make sure to inform your provider, as you will require adjustment of the clear liquid diet in such a manner that your blood sugar level remains stable.
• A clear liquid diet is deficient in calories and nutrients, so it shouldn't be used for extended periods of time.