A therapeutic diet is a meal plan that controls the intake of certain foods or nutrients. It is part of the treatment of a medical condition and are normally prescribed by a physician and planned by a dietician.A therapeutic diet is usually a modification of a regular diet.It is modified or tailored to fit the nutrition needs of a particular person. Therapeutic diets are modified for (1) nutrients, (2) texture, and/or (3) food. allergies or food intolerances.HSS Training Academy 1 Types of Therapeutic Diets. Common therapeutic diets include: 1. Nutrient modifications • No concentrated sweets diet • Diabetic diets • No added salt diet • Low sodium diet • Low fat diet and/or low cholesterol diet • High fiber diet • Renal diet 2.