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Catherine Clifford cnbc.com

Jack Dorsey's 11 biohacks

From walking five miles from his home to the office, no food all weekend, to using saunas and ice baths in the evening…

Dorsey only eats dinner. Sometime between 6:30 p.m. and 9 p.m. he has a meal of fish, chicken, or steak with a salad, spinach, asparagus or Brussels sprouts. He has mixed berries or some dark chocolate for dessert and also sometimes drinks red wine.

“I’ll go from Friday ‘til Sunday. I won’t have dinner on Friday. I won’t have dinner or any meal on Saturday. And the first time I’ll eat will be Sunday evening. I’ve done that three times now where I do [an] extended fast where I’m just drinking water,” Dorsey says.

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