MK - We love Columbia Harbour House! Fish, Shrimp, etc. I also agree with Cosmic Rays - they have a rotisserie chicken, BBQ ribs, potato, green bean platter that was enough to share. I also think they have salads and wraps.
Epcot - FW - We really like Sunshine Seasons and it has tons of options and it should be easy to find something there - asian, salads, flatbreads/sandwiches, grilled stuff.
WS - I have not eaten at these places but I would think Yakitori House in Japan or Tangeriene Cafe in Morocco would offer healthier options.
DHS - I think it is called Studio Catering Company - right beside Jedi Training Academy. They have wraps and grilled sandwiches. I agree too with Pizza Planet - their pizzas and salads are good!
AK - Flame Tree BBQ has good options but I was not impressed when we ate there. I would probably do a salad or pizza and salad combo at Pizzafari.
Those are my two cents! Good luck deciding!