Paleo-style diet with periodic fasting
Uses itAverages a 24-hour fast about every two weeks and a 72-hour fast about once a quarter. Drinks plenty of tea and chews sunflower seeds while fasting.
Willink told Business Insider he eats a mostly Paleo-style diet because that is when he performs well. He fasts periodically, though not on a strict schedule.
“That's when I perform well.”Jocko Willink
Source: A retired Navy SEAL commander who sometimes goes 72 hours without food explains the diet philosophy that keeps him in fighting shape (article)