In the May Journal, there's a chart showing how many Zone "blocks" are needed at each meal for various body types, ranging from small females (2 blocks for each of 5 meals & snacks) to "athletic, well-muscled male" (5 blocks per).
I'm a little unsure which group I'd fall in. At 6'2", 180 lbs., 13-15% body fat, I would guess "large male" (and the block requirement would be consistent with my calculator results on Dr. Sears' site).
But there is also a category for "large hard gainer" which would increase my food consumption by over 20%. What's Crossfit's definition of a "hard gainer"?