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Arthur Brooks
Professor, Vanderbilt University; Senior Fellow, Harvard Business School, Vanderbilt University

My Protocol for Peak Mental Performance and Clarity

📅 Feb 11, 2026 Tim Ferriss 14 MIN 15546 VIEWS 87 SEGMENTS · 2 SPEAKERS
Arthur Brooks is a professor at the Harvard Kennedy School and the Harvard Business School, where he teaches courses on leadership and happiness. His next book, The Meaning of Your Life: Finding Purpose in an Age of Emptiness, will be released on March 31, 2026. This episode is brought to you by: Monarch track, budget, plan, and do more with your money: https://www.monarch.com/tim AG1 all-in-one nutritional supplement: https://drinkag1.com/tim Humann’s SuperBeets Sport for endurance and recovery: https://humann.com/tim Tim Ferriss is one of Fast Company’s “Most Innovative Business People” a...

Questions asked in this interview

5
  1. 0:47So, I'm like, yeah, you know what?
  2. 3:31Got into my pool for a few minutes and got out, cold shower, came back in and then sat down and this was my kind of deep work prep, right?
  3. 8:14Which is not the point, right?
  4. 10:07But why do you ask about SSRIs?
  5. 10:43People are like, 'What is this mad scientist poet stuff?' You want to just explain what we're talking about?
Tim Ferriss 0:00 ↗
Well, right now I'm day three of segueing into ketosis. And we're always producing ketones, but I'm probably just because I've done this a lot, I'm probably at right now like 1.2 millimolar in terms of blood concentration of beta-hydroxybutyrate after ketosis.
Arthur Brooks 0:21 ↗
You like how it feels?
Tim Ferriss 0:22 ↗
I love how it feels in terms of mental acuity. I also because I have neurodegenerative diseases in my family and metabolic dysfunction see doing let's just call it four to six weeks of nutritional ketosis once or twice a year to appear to be very cheap insurance.
Arthur Brooks 0:44 ↗
What's your APOE profile?
Tim Ferriss 0:45 ↗
ApoE 3/4.
Arthur Brooks 0:46 ↗
You're 3/4.
Tim Ferriss 0:47 ↗
Yeah. 3/4. There are other risk factors. I also have relatives who are 3/3 but nonetheless developed early Alzheimer's. So, I'm like, yeah, you know what? I like how I feel. I need less sleep when I'm in ketosis. I naturally wake up very, very alert, which is unusual for me. I wanted to mention that first just to set the stage in a way.
So, I for decades did minimum 30 grams of protein within 30 minutes of waking up. I still think that is a great option for me now for a host of reasons that I could get into, but I'll keep it simple. I almost always do intermittent fasting where I am fasting until 2 or 3 p.m. in the afternoon, but when I wake up, like this morning, I woke up at 7:30 and I was preparing for this conversation. So, I wanted to block out a few hours to do that, but woke up, had, now this is mildly stimulating, but I wanted to have a little bit because I'm also jet-lagged and arrived at around midnight last night. Had some cacao with a little bit of cacao butter mixed in.
Arthur Brooks 1:53 ↗
Nice.
Tim Ferriss 1:54 ↗
Just enough under three grams of net carbs.
Arthur Brooks 1:58 ↗
Because you're keeping your net carbs to 30 a day probably, right?
Tim Ferriss 2:00 ↗
I'm keeping my net carbs to, for me personally right now, under 10 grams.
Arthur Brooks 2:05 ↗
Under 10. That'll get you into ketosis fast.
Tim Ferriss 2:07 ↗
Under 10. Yeah. Especially if I am already adapted to intermittent fasting so that I'm doing 16 to 18 hours of fasting with a short six to eight hour window of eating. Once you get to 16 to 18 hours, especially if you're doing some exercise, let's just say in the morning or any other point, you're depleting your liver glycogen and you're going to get into the habit. Your metabolic machinery will develop the habit and the capability of producing ketones even when you are eating carbohydrates in that limited window of eating.
Arthur Brooks 2:39 ↗
And you don't take exogenous ketones.
Tim Ferriss 2:41 ↗
I will occasionally on a day like today because I know that I'm on effectively let's call it day two and a half of segueing into ketosis. I think my natural production is roughly where I mentioned my natural production right now is probably around 0.9.
Arthur Brooks 2:59 ↗
Mhm.
Tim Ferriss 3:00 ↗
Let me just back up. So I wake up at 7:30. I have the cacao plus some cacao butter. Then I sit in and I have a hot tub. This is like one of my indulgences. It's not actually that expensive, but I sit in a hot tub and I meditated for 10 minutes with an app, the Waking Up app. Henry Shukman is my spirit animal. Amazing mindfulness/zen focused practice. Did that 10 minutes, that's it.
Arthur Brooks 3:26 ↗
Got out. It is pretty chilly right now in Austin.
Tim Ferriss 3:31 ↗
Gets down to, I think last night it was 37 low. Got into my pool for a few minutes and got out, cold shower, came back in and then sat down and this was my kind of deep work prep, right? No interruptions.
Arthur Brooks 3:46 ↗
There's non-trivial similarity to what I'm trying to do neurocognitively.
Tim Ferriss 3:50 ↗
Yeah, exactly. And then on the way here, about 15 minutes prior to arriving, knowing my start time, there were a few other bells and whistles that I threw in nutritionally in terms of supplements and so on earlier in the morning, but had one nitro cold brew from Starbucks and about 15 milliliters of exogenous ketones.
Arthur Brooks 4:14 ↗
Mhm.
Tim Ferriss 4:14 ↗
In this case, it's BHB bonded to 1,3-butanediol, which I do have some reservations about. Long-term chronic use, I think could be liver toxic, but I'm doing it very intermittently. And so, for the let's just call it four days of segue into nutritional ketosis, I will use exogenous ketones sometimes as a boost.
Arthur Brooks 4:41 ↗
Mhm.
Tim Ferriss 4:41 ↗
And that's it. That was the.
Arthur Brooks 4:42 ↗
And it's working great for you. Here's a big takeaway. I think you got to that through experimentation. You didn't get that by getting it off the internet. You learned a lot about these different variety of protocols.
Tim Ferriss 4:53 ↗
Mhm.
Arthur Brooks 4:54 ↗
And you tailored it and tried it and over a number of years came upon what worked best for you. And it's exactly what I've done too. And everybody watching needs to treat their life like a lab.
Tim Ferriss 5:05 ↗
Yeah.
Arthur Brooks 5:06 ↗
Experimentation is king. The precursor to good experimentation is information. Is scientific information. And then it's getting experience through the experimentation and figuring out what your own protocol actually is.
Tim Ferriss 5:18 ↗
Mhm.
Arthur Brooks 5:18 ↗
Because as they say in the ads, your results may differ.
Tim Ferriss 5:22 ↗
Yeah. Right. Exactly. And so for me, if I'm weight training, I will typically weight train late afternoon. That's just always been my preference.
But if we had not had this podcast today, I would have done zone 2 training.
Arthur Brooks 5:34 ↗
Mhm. In the morning.
Tim Ferriss 5:35 ↗
Right. Exactly. After the meditation.
Arthur Brooks 5:37 ↗
Before you eat.
Tim Ferriss 5:38 ↗
Before I eat.
Arthur Brooks 5:39 ↗
You like fasted cardio?
Tim Ferriss 5:40 ↗
I do like fasting.
Arthur Brooks 5:41 ↗
Yeah, I do too.
Tim Ferriss 5:42 ↗
Especially when I'm trying to get into ketosis or intermittent fasting because it'll help me deplete the stored glycogen at a faster rate. If it is too high, just for people who may be interested in intermittent fasting or ketosis, if the exertion level is too high or if it is resistance training, sometimes it will spike glucose in such a way that makes it a little counterproductive if you're trying to get into ketosis. So the zone.

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APA, MLA, BibTeX
APA

Brooks, A. (2026, February 11). My Protocol for Peak Mental Performance and Clarity [Interview transcript]. Tim Ferriss. CEOInterviews.AI. https://ceointerviews.ai/interview/3006635/

MLA

Arthur Brooks. "My Protocol for Peak Mental Performance and Clarity." Tim Ferriss, 11 Feb. 2026. Transcript, CEOInterviews.AI, https://ceointerviews.ai/interview/3006635/.

BibTeX
@misc{brooks2026_3006635,
  author       = {Arthur Brooks},
  title        = {My Protocol for Peak Mental Performance and Clarity},
  howpublished = {Interview transcript, Tim Ferriss. CEOInterviews.AI},
  year         = {2026},
  month        = {feb},
  url          = {https://ceointerviews.ai/interview/3006635/},
  note         = {Speaker-attributed transcript with timestamps}
}