A large plain pizza from dominoes is 1984 calories. so trying to get 2500 calories eating clean is gonna be a bit hard, lol. what you can do is buy a vanilla or chocolate whey protein, add allnatural peanut butter, banana, fat free yogurt, and use fat free milk or whole milk to make it even more calories. also throw in some heavy whipping cream. thats a nice way to pack on some calories while eating healthy. weight gainers have alot of sugar in them so they suck.