I ate a lot after surgery. The restriction was there and I could only do a little at a time, but I was non-stop HUNGRY, so I ate non-stop. At around week 3-4 weeks...when I was encouraged to eat 1200 calories a day, I started feeling more content and like I was on a sustainable diet. I still ate 6 times every day....and often still do.
You will be able to eat more of mushy "slider" foods than foods with more substance.
Eating is not the devil. Eating a sane number of calories during loss phase is not a bad thing. Feeling well enough and having the energy to do the exercise that boosts your metabolism...is a good thing.
You don't need to be a starving zombie to lose weight. You definately need to keep track and make good food choices, but the extremely low calorie diets are both unwise and can set you up for rebound regain.
Eat sensibly. Good choices. Stay within calorie limits. Boost your metabolism with 15 minutes of cardio every day. (doesn't have to be anything fancy, some very heavy folks reach cardio just by taking a walk)
Stay active, stay nourished. You will lose weight.