Some ways to get adequate nutrition when on a liquid diet include adding liquid supplements to the diet or getting more calories by adding dry milk to drinks, according to MedlinePlus. Other ways to get enough nutrition and calories on a liquid diet include adding instant breakfast powder to drinks, strained meat to broth, butter to soup or hot cereal and syrup or sugar to beverages.
Those who are on a liquid diet must not eat solid food, explains MedlinePlus. This diet is easier for the body to digest than solid food, and it has enough salt, protein, fluid and minerals for energy. Most people on a full liquid diet get about 45 grams of protein each day and 1,350 to 1,500 calories. People on this diet may not get enough fiber, minerals and vitamins, however, so doctors often suggest certain vitamins to take in addition to the diet.
A liquid diet is restrictive, and only certain foods are available including water, fruit juice or nectar, pudding, custard and plain ice cream, sherbet and frozen yogurt, states MedlinePlus. People on this diet may eat Popsicles, sugar, honey and syrup, in addition to soup broth, but without solids. Clear soda, such as lemon-lime soda or ginger ale is part of a liquid diet, as is gelatin, coffee and tea. People also often add liquid supplements such as Ensure, Boost, Sustacal and Resource.