The egg drop soup should be OK; it's only chicken broth after all. The amount of egg you beat
and put in the hot soup is protein, too, so go for it!
Does your doctor have you on liquids only, or what??
When I was doing my pre-op eating I focused on protein first, and eliminated all white foods such
as bread, pasta, rice and potatoes. I was surprised to find that the more protein I put in my diet
the less hungry I was, and the fewer refined carbs I wanted.
I would say that the tuna would be a good choice, too.
If you get too hungry you'll scarf down anything you can get, and that will make you feel badly
and awful and think all kinds of mean things about yourself, and that will make you eat more
and on and on and on with the evil circle.