Need for Dietary Supplements
Food is a source of nutrients for the human body, despite how it is grown or prepared. Macro- and micronutrient deficiencies are frequently an issue in obese individuals who have been choosing high- calorie, low-quality foods because of price, taste, or convenience.
Presurgery supplementation can reduce mortality rates  and allow for better nutrition habits for supplementation to be established. Preoperative nutrient deficiencies have been reported for vitamin D, ferritin, hemoglobin, vitamin B12, and thiamine . Nutrition guidelines should include at least one excellent multivitamin and mineral capsule daily. Postsurgery this supplement capsule can then be opened up and added to beverages and soft foods.
Postsurgery patients consume a liquid diet for the first week, which needs to provide liquid dietary supplements to maintain muscle mass and improve immune function . By week two they can usually progress to capsule supplements that can be opened and incorporated into liquids. Crushing of tablets is not recommended because absorption is significantly impaired .