Zac Griffith’s diet is high in lean protein such as wild game, chicken breast, fish, egg white and protein powders/bars sparingly. Zac recommends eating as much green vegetables as possible along with 1-2 gallons of water daily. Carbohydrates are an energy source and should be consumed early in the day and sparingly.
Diet can be complicated, so always consult an expert and/or physician before beginning any diet. As a starter, there is a ton of information on the web as well as a couple of books Zac recommends to educate you:
Nutrition is really simple. You just need to know your diet and execute it. It takes discipline, planning, preparation, practice…sound a little like hunting? Just focus on one major change at a time. For example, the first week cut sugar-packed drinks and sodas from your diet. The week after swap a bag of chips for a piece of fruit. As you progress and trim away the bad habits the good ones will become second-nature. You’ll love the way you’ll feel and that will drive you to continue improving.