Answer 1 After surgery doctors suggests to sustain on liquid diet. Still there are certain limitations regarding liquids. Liquid diet is for providing basic hydration and nutrition for metabolic activities. Proteins are a vital component of post surgery. All you need is protein shakes that help to heal the surgery incisions and prevent anemic conditions. The diet says no to alcohols, carbonated drinks, and coffee. Alcohols are of high calorie content, barging to weight loss. Alcohols also cause dehydration. Carbonated drinks considered these cause gas and bloating. As per suggestions, one must have clear juices, sugar free gelatins, protein shakes. Liquid diet is for first three to four weeks.