What's limiting your ability to eat a full diet? Is it nausea, or do you vomit? And the same regarding liquids...do you have physical symptoms or do you just not drink enough? I 'struggle' with my liquids every day, but the struggle is getting my head to remember that I need to drink, not that water bothers me.
I find myself wanting to eat easy foods and repeating the same foods over and over...it takes effort to say 'no, not having yogurt for breakfast, cook an egg'.
You really need a visit with your surgical team/dietician to get you moved on to a wider range of foods. Your labs may be WNL now, but your body is telling you that you're not fueling it appropriately.