It probably makes sense then to eat a good healthy breakfast, healthy snacks then a TS dinner slightly earlier than normal.
Admittedly we eat more in Disney and our normally fruits a veggies rich meals switch over to fried and quick meals. We always leave feeling like we've shocked the digestive system.
Yes~

Even in some of the non-fried meals I think that WDW cooks use a lot more oil than we are used to. (even a veggie omelet breakfast at POP was more oil than one person in our family could handle)
When we stayed onsite, one of the strategies we used to minimize that yucky feeling was to split breakfasts in half and share. (We did this for lunches as well and were able to better utilize our dining plan without skipping any meals, going hungry or feeling like over stuffed beached whales

)
We were satisfied but not overstuffed and the oiliness was not so much that it led to a bout of "I-can't-leave-the-bathroom-right-now-itis"

.
Now that we stay offsite (half the money per trip means twice as many trips

)
we eat breakfast in our room, and pack and take our "lunch" with us in a small soft sided cooler bag.
We take carrot sticks, broccoli, pepper strips and cucumber slices in small zip bags with small dip packets/cups,
nuts like raw almonds (we like them) and cashews, refreshing fruits like apples, grapes, oranges, Sweets and Beets chips, cheese sticks
and a cookie or two along with frozen juice boxes to keep things cold and chilled water for drinking
The first time we tried this we packed sandwiches too, but discovered that a sandwich was too much for us.
We also learned that we prefer to snack throughout the day instead of doing a "meal".
We plan our snacks like mini-meals and that works for us.
Our last vacay we focused on the water parks and DQ, but we noticed that some of the people around us at TL and BB
were casting wishful glances at our yummy snacks even while they were busy eating what they had just purchased.
Eating breakfast in and packing our snack/lunch allows us to enjoy a table service restaurant for dinner- guilt free-
because we have been eating healthy all day and saving money, so eating out at night is a real treat.
When we do eat out at night we have a few favorites:
Sweet Tomatoes & Bonefish Grill (off site but pretty close),
and thanks for the tip about Costco and Wolfgang Puck Express Marketplace-
WPE is one of our favorites too.

Texas de Brazil was a fun exploration of a new cuisine- a really unique dining experience, and with a birthday coupon, it was less expensive than our dinner at Boma.
If you choose to forgo the dining plan then eating off site is a great option

The dinners I have had at Bonefish Grill are just as good as the Flying Fish but cost a
whole lot less.

Have a great trip!