The Zone Diet

Hello everyone,

I am not sure if this is the appropriate place to ask this, but do any of you guys know about the Zone Diet?

A buddy of mine is currently competing in crossfit, and is needing some advice on his current diet.

Anyone able to offer advice on this matter?
Thank you

Never knew they called it "The Zone" - but essentially it's just based on a ratio of 40:30:30 for carbs/protein/fat

What's the advice he's needing? I'm by no means an expert, but can maybe nudge him in the right direction.