Hello Michelle,
My Dad is also a diabetic so eating well balanced meals are important when we travel with him to Disney World. And that is absolutely possible no matter what Disney Dining Plan you have.
If you choose to go with the
Quick Service Dining Plan, there are a few places that we always go with my Dad.
In Epcot, I love Sunshine Season Food Fair in the Land Pavilion. There is always a wide variety of salads, tofu dishes, and rotisserie chicken here. Also in World Showcase, we enjoy the hummus at Tangierine Cafe.
In the Magic Kingdom, Cosmic Ray's Starlight Cafe also has rotisserie chicken. But they have veggie burgers too.
All of these are Quick Service restaurants. And you can typically ask for veggie sticks or fruit slices as a side if you'd like. Also, many quick service restaurants and snack carts will have fresh fruit, pretzels, and frozen fruit bars. Your Dad is sure to find something he'll be able to enjoy!
Hope this helps!