This will be my brothers first time to Walt Disney World so I wantedto know what you would recommend for AR's for a 17 year old boys first time to WDW?

What kind of food is he interested in? Does he have any significant dislikes of food? Is he still eating like a 'growing boy' or has that tapered off?

Anticipating that he's 'always eating' I would think a buffet would be a good choice - maybe the Biergarten in Germany in Epcot, or Boma in the Animal Kingdom Lodge. But if he's a "hamburger and pizza only" kind of kid, those might not be good choices.