He fasts on weekends

From Friday evenings to Sunday evenings, Jack likes to do extended fasts, during which he only consumes water. On a recent podcast with Ben Greenfield Fitness, he said, "The first time I did it, like day three, I felt like I was hallucinating. It was a weird state to be in. But as I did it the next two times, it just became so apparent to me how much of our days are centered around meals and how - the experience I had was when I was fasting for much longer, how time really slowed down." OK!!!

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