A liquid diet usually helps provide sufficient hydration, helps maintain electrolyte balance, and is often prescribed for people when solid food diets are not recommended, such as for people who suffer with gastrointestinal illness or damage, or before or after certain types of medical tests or surgeries involving the mouth or the digestive tract.
Negative side effects include fatigue, nausea, dizziness, hair loss and dry skin which are said to disappear when the person resumes eating.
This includes vegetable broth, bouillon (excepting any particulate dregs), clear fruit juices such as filtered apple juice or white grape juice, clear fruit ices or popsicles, clear gelatin desserts, and certain carbonated drinks such as ginger-ale and seltzer water.
Typically, this diet contains about 500 calories per day, which is too little food energy for long-term use.
Some individuals who are told to follow a full-liquid diet are additionally permitted certain components of a mechanical soft diet, such as strained meats, sour cream, cottage cheese, ricotta, yogurt, mashed vegetables or fruits, etc.