This is too vague of a request. If you're trying to budget, actual menu pricing will prevail over "actual people advice." You may enjoy a light breakfast of a pastry or fruit and a cup of coffee. Somebody else may want bacon, eggs and pancakes. A dinner to you may include appetizers, alcoholic beverages and dessert, while a dinner to them will skip those. Not to mention, there's a tremendous amount of diversity within Disney's pricing, depending on what you eat and where you eat it. Think $15 to park at a car at Pop Century vs. $25 at the Grand Floridian -- the latter doesn't cost Disney more, but they know people at the latter are more accepting to the higher price. A similar trend is true of various restaurants, although not quire as true as in the past (way back in the 1990s, when the All-Star Resorts first opened, their food courts served the exact same food as the Contemporary or Grand Floridian snack bars, but at a much cheaper price point).
Also, I'm not a small guy nor am I a big guy, but there's absolutely no way I could eat two sit down meals + a counter service meal each day at WDW -- portions are large (and that's not including appetizers or desserts) and I'd be stuffed after a couple days, seeking out lighter fare.
