Therapeutic diets are modifications of normal diets prescribed by doctors and planned by dieticians to improve specific health conditions. They may change nutrients, calories, and texture of foods. Some common therapeutic diets include liquid diets used short-term after surgery; soft diets with easy to chew and digest foods; diabetic diets regulating carbohydrate intake; low-cholesterol diets limiting saturated fats; and sodium-restricted diets for conditions like hypertension. The document provides details on the goals and food restrictions of various therapeutic diets used to treat different medical issues.