[InSteady]

I'm sure this won't be enjoyable to many people, and only works well for certain meals, but my secret weapon is gelatin powder. Mix with water until paste forms in your bowl then put steaming hot food on top and it will turn into a kind of 'creamy' sauce-like consistency. Nice mouth feel without too much flavor.

Oh, and learning to cook meat/protein so it is tender, browned, flavorful, and seasoned properly. It also seems like acid is way under-utilized in a lot of lazy / American style cooking. Helps a lot with palatability and digestion to use lime juice, rice vinegar, and other acidic ingredients during the cooking process.

Eat more veggies, too. They are full of digestive enzymes, but most veggies don't add too many calories.