Liquid fasting before an operation: how to follow it correctly

A liquid fast consists of liquids such as water, broth, herbal teas, etc. which are easily digested and leave no undigested residue in the intestinal tract. Your doctor may prescribe a liquid fast before certain medical procedures or if you have certain digestive issues. Since a liquid fast cannot provide you with enough calories and nutrients, it should not be continued for more than a few days. Liquid fasts can use blended colored vegetables as long as you are able to see through them. Foods can be considered liquid if they partially or completely melt into liquid at room temperature. You cannot eat solid foods if you are on a liquid fast.

Purpose of liquid fasting

A liquid fast is often used before tests, procedures, or operations that do not require food in the stomach or intestines. Like before a colonoscopy. It may also be recommended as a short-term diet if you have certain digestive problems, such as nausea, vomiting, or diarrhea, or after certain types of surgery.

Liquid Fasting Details

A liquid fast helps maintain adequate hydration, provides some important electrolytes, such as sodium and potassium, and provides some energy at a time when a full diet is not possible or recommended. The following foods are generally allowed on a liquid fast:
water (still, sparkling or flavored)
Fruit juices without pulp, such as apple or white grape juice
Fruit flavored drinks
Soft drinks: Perrier, Badois
Tea or coffee without milk or cream
Strained tomato or vegetable juice
Sports drinks
Clear, fat-free broth
Lemon drops or peppermint slices

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Depending on your medical condition, your doctor or dietician may modify the above list. For some tests, such as colon exams, your doctor may ask you to avoid red-colored fluids. Any food not listed above should be avoided.

A typical menu for a liquid fast may look like this:


1 glass of fruit juice without pulp
1 cup coffee or tea, dairy-free
Sugar or honey, if desired


1 glass of fruit juice without pulp
1 glass of water
1 cup broth
1 pulp-free frozen drink
1 cup coffee or tea, non-dairy, or non-alcoholic beverage
Sugar or honey if desired

Having dinner

1 cup juice or water without pulp
1 cup broth
1 cup coffee or tea, dairy-free
Sugar or honey, if desired

Results Although liquid fasting is not very exciting, it serves its purpose. It is designed to keep your stomach and intestines clean and to limit strain on your digestive system while keeping your body hydrated.

Risks of liquid fasting

Since a liquid fast cannot provide you with enough calories and nutrients, it should not be used for more than a few days. Use liquid fasting only as directed by your doctor. When your doctor prescribes a liquid fast before a medical exam, be sure to follow the diet’s instructions exactly. If you don’t follow the diet exactly, you risk having an inaccurate test and having to postpone the procedure to another date. If you have diabetes, consult your doctor or dietitian.

A liquid fast should consist of clear liquids that provide about 200 grams of carbohydrates evenly distributed throughout the day to help manage blood sugar (blood sugar) levels. Blood sugar levels should be monitored and the transition to solid foods should be made as soon as possible

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