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Here’s my protocol for my usual monthly 3-day fast from Thursday dinner to Sunday dinner: On Wednesday and Thursday, plan phone calls for Friday. Determine how you can be productive via cell phone for 4 hours. This will make sense shortly. Have a low-carb dinner around 6 p.m. on Thursday. On Friday, Saturday, and Sunday mornings, sleep as late as possible. The point is to let sleep do some of the work for you. Consume exogenous ketones or MCT oil upon waking and 2 more times throughout the day at 3- to 4-hour intervals. I primarily use KetoCaNa and caprylic acid (C8), like Brain Octane. The exogenous ketones help “fill the gap” for the 1 to 3 days that you might suffer carb withdrawal. Once you’re in deep ketosis and using body fat, they can be omitted. On Friday (and Saturday if needed), drink some caffeine and prepare to WALK. Be out the door no later than 30 minutes after waking. I grab a cold liter of water or Smartwater out of my fridge, add a dash of pure, unsweetened lemon juice to attenuate boredom, add a few pinches of salt to prevent misery/headaches/cramping, and head out. I sip this as I walk and make phone calls. Podcasts also work. Once you finish your water, fill it up or buy another. Add a little salt, keep walking, and keep drinking. It’s brisk walking—NOT intense exercise—and constant hydration that are key. I have friends who’ve tried running or high-intensity weight training instead, and it does not work for reasons I won’t bore you with. I told them, “Try brisk walking and tons of water for 3 to 4 hours. I bet you’ll be at 0.7 mmol the next morning.” One of them texted me the next morning: “Holy shit. 0.7 mmol.” Each day of fasting, feel free to consume exogenous ketones or fat (e.g., coconut oil in tea or coffee) as you like, up to 4 tablespoons. I will often reward myself at the end of each fasting afternoon with an iced coffee with a bit of coconut cream in it. Truth be told, I will sometimes allow myself a SeaSnax packet of nori sheets. Oooh, the decadence. Break your fast on Sunday night. Enjoy it. For a 14-day or longer fast, you need to think about refeeding carefully. But for a 3-day fast, I don’t think what you eat matters much. I’ve done steak, I’ve done salads, I’ve done greasy burritos. Evolutionarily, it makes no sense that a starving hominid would need to find shredded cabbage or some such nonsense to save himself from death. Eat what you find to eat.
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Timothy Ferriss (Tools of Titans: The Tactics, Routines, and Habits of Billionaires, Icons, and World-Class Performers)