I had my surgery less than a week ago, just curious why the foods I am allowed to eat are sugar free or fat free? I learned before in a nutrition class that modified food is usually not as nutritious.

Fat and sugars are useless calories. Even when you start eating regular foods your doctor may advise that you take Calcium and Vitamin supplements. Protein intake is usually the primary concern.

We can't see what you're allowed to eat, but most docs and nutritionists ask us to eat non-processed foods. During the post-op phase this could be difficult all the time but once you're allowed to eat solid food, fresh meats, seafood, veggies and minimal fruit should be how we eat. Shoulda eaten this way before surgery but we didn't have the tool to help us feel satisfied with so much less food.