Liquid Diet: Justification, Permitted Food and General Considerations

This kind of diet includes only foods that do not contain solid elements, it is not recommended in order to lose weight.

But it is made as therapy for certain pathological conditions and helps in the relief of some symptoms.

Justification of the liquid diet

It is difficult to obtain the nutrients necessary for the proper functioning of the organism, when a liquid diet is being followed, so this diet should be followed only under medical supervision.

There are several health conditions that justify a liquid diet, such as:

Crohn’s disease

People with Crohn’s disease or ulcerative colitis have a condition in which their bowels tend to swell.

This causes lesions in the lining of the digestive tract, causing constant diarrhea or constipation, cramping in the abdomen and rectal bleeding.

In Crohn’s disease there are outbreaks, the symptoms become acute and then disappear.

When the attack occurs, the objective is to decrease the amount of depositions that are made.

A liquid diet reduces the amount of solids that pass through the gastrointestinal tract so abundantly, which is not recommended when the intestines are inflamed.

Postoperative recovery

After performing surgery, in some cases a liquid diet may be recommended to aid in recovery.

This is very important in surgeries that affect the stomach and intestines, because it is necessary to reduce the tension within the gastrointestinal tract.

Presence of nausea or vomiting

When you suffer from food poisoning, a serious stomach virus or other problems that may cause continued vomiting or nausea.

A liquid diet can be very useful to ensure that nutrients are ingested while recovering the electrolyte balance in the body.

Colonoscopy or other medical procedures

In some medical procedures it is required that an absolutely liquid diet be followed before carrying out the procedure.

In the case of a colonoscopy, the inside of the colon is examined and it is necessary to clean it of the solid waste present and the liquid diet facilitates this procedure.

Foods allowed in the liquid diet

The restrictions of a liquid diet will depend on the objective of the diet.

Sometimes a clear liquid diet may be required, which is much more restrictive than a normal liquid diet.

Among the foods allowed in a clear liquid diet can be mentioned:

  • Water, natural, carbonated or flavored, adding a lemon wheel, herbs and other flavorings.
  • Fruit juices without pulp, fruit flavored drinks, lemonade or fruit punch.
  • Soft drinks and other carbonated beverages, including energizing sports drinks.
  • Gelatins
  • Vegetable juices, well filtered to avoid any particle in solid form.
  • Tea and coffee sweetened but without milk or cream.
  • Honey, sugar, hard candies.
  • Broths clear and free of fat.
  • Ice creams that do not contain milk, seeds, nuts or solid fruit particles

In the general liquid diet the following foods are considered:


In addition to those recommended for the clear liquid diet, you can consume beverages as nutritional supplements (Ensure or Boost).


In addition to the juices, you can consume soft fruit compotes.

Dairy products

Skim milk, soy milk, almond milk, fat-free, dairy puddings, liquid yogurt, soy protein powder, egg or milk serum.


In thin vegetable juices alone or mixed.


Soups based on chicken broth, meat, fish, vegetables and preferably low in sodium.

It can be allowed in some cases, cooked cereals such as wheat, semolina or oatmeal cream, mashed potatoes, creamy soups, butter, olive oil, peanut butter.

General considerations

  • Liquid diets are not recommended to lose weight, since it is difficult to obtain enough nutrients and calories in a liquid diet, if they are in a balanced diet. That is why it is essential to balance the nutritional needs with an adequate selection of foods.
  • Liquid diets can limit the consumption of proteins, micronutrients and healthy fats. So long-term follow a liquid diet can cause fatigue, vitamin deficiency and gastrointestinal problems.
  • The main objective of a liquid diet is to provide the body with easily digested food while a condition is overcome, trying to supply the proteins, salts, fluids and minerals that are needed to maintain the main functions of the human body.
  • When following a liquid diet, you should consume 1,350 to 1,500 calories per day. The ideal is to consume around 45 grams of protein per day.
  • It is important to avoid excess sugar, especially in the case of Crohn’s disease.
  • In diseases such as diabetes, it may not be advisable to perform a liquid diet, because of its possible adverse effects.