OK, I'll bite! I've added my thoughts on some of your picks. FWIW, I eat very healthy at home (to the tune of over 100 pounds lost!), but I generally order whatever I want when we're at Disney. So I may not have tried some of the healthier menu items we're talking about, but I'm certainly familiar with having to swap items and make healthier substitutions.
If you're really set on eating healthy at Disney you CAN ask for preparation of items to be changed. At TS restaurants, at least, the chefs can be very accommodating to any special dietary requests, not just allergies. They can do more than just remove sauces and sides.
50's Prime Time Cafe
Appetizers - order 2 for a meal = total cost $14
Chicken Noodle Soup & Cousin Amy's Iceberg Lettuce Wedge, plus unsweetened iced tea
Scratch the lettuce wedge; it's covered in full-fat blue cheese dressing and bacon. The dressing alone will amount to more calories than some full entrees on the menu.
I'd substitute the grilled chicken sandwich without cheese, accompanied by a house salad, in its place.
Liberty Tree Tavern
Colony Salad minus the dressing & unsweetened iced tea = total $17
No dressing at all? You might ask them if they have balsamic vinegar they could give you, instead of the oil-heavy vinaigrette they use. There's cheddar on the salad, too.
I'd also look at their catch of the day fish entree and see how it's prepared, and if they can broil or grill it for you.
Rainforest Cafe
Tuscan Chicken & water = total $18
Definitely one of the better things you can order here, I believe. The sauce still packs some fat but it's far less than most dishes. Livestrong lists the c/f for this dish at 525/34.
And below what I think are some healthier options around the park...but again, getting with the chef is likely your best bet at TS places!
MK
Columbia Harbor House (CS); anchors away hummus sandwich w/apple slices
The Plaza (TS); chicken strawberry salad w/dressing substitute
Cosmic Rays (CS); 1/2 chicken (no skin) w/2 veggies, grilled chicken sandwich
Epcot
Sunshine Seasons (CS); roast chicken, tuna salad, grilled fish...lots of choices here if you watch the sides, sauces, and salad dressings and avoid the sandwiches (fatty breads and lots of mayo) and noodles (sauce, sodium)
La Hacienda de San Angel (TS); grilled talapia, flank steak (no beans/rice)
Teppan Edo (TS)
Tangierine Cafe (CS); couscous, tabouleh, chicken shawarma
Animal Kingdom
Yak & Yeti (TS); salmon, tuna, mandarin chicken salad w/dressing on the side
Flame Tree BBQ (CS); 1/2 chicken (no beans/muffin), turkey sandwich
Tusker House (TS); lots of salads, fresh veggies and fruit, couscous, hummus, fish, chicken...a great option if you can keep yourself away from the dessert trays!
I have a strong dislike for the food at DHS and we only ever eat at Sci-Fi and Starring Rolls so I have nothing to offer you for there.
Oh, and when it comes to resort dining, I don't think you can beat Animal Kingdom Lodge. Boma, Jiko, and Sanaa all have amazingly fresh, delicious, but healthy options.
Best of luck to you...it takes a lot of willpower to avoid junk food at the World, especially when you're walking 10+ miles a day. But you can definitely make it happen!