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5-Bullet Friday

The latest from author and investor Tim Ferriss

Hi All!

Here is your weekly dose of 5-Bullet Friday, a list of what I'm pondering and exploring. I threw in an extra bullet for added spice.

What I'm listening to

"Granada" (YouTube, Spotify, Apple Music) by Lebanese composer, oud master, and singer Marcel Khalife. This is two songs in one. The first half is totally unlike the second half. It's a long 'un and worth the time.

My #1 writing priority this week

"How I Beat Lyme Disease with The Ketogenic Diet." I started writing this as a reply on X to Greg Yang, co-founder of xAI, who recently stepped down from xAI to address his debilitating case of Lyme disease. Ultimately, I decided that a blog post could provide more detail and allow proofreading by credible scientists, so here we are. The post covers the science, exact how-to protocols, and much more.

What I'm excited to share

My appearance on The Shawn Ryan Show. Shawn is a former U.S. Navy SEAL and CIA contractor who served for 14 years across multiple combat missions. He led us to some edgy and strange topics that I don't usually discuss publicly. I had a lot of fun.

His show is one of the fastest-growing and most popular podcasts in the world, and I was very impressed with the entire operation he's built. Kudos to Shawn and his entire team.

Science I'm paying attention to

"Alzheimer's blood tests may be misleading for people with kidney problems." Summary: "A large study found that people with impaired kidneys tend to have higher Alzheimer's biomarkers, yet they don't face a higher overall risk of dementia. For those who already have elevated biomarkers, kidney problems may speed up when symptoms appear. The findings show that kidney health can change how Alzheimer's blood tests are read. Doctors may need to consider both organs to get a clearer picture." Pair this article with my brand-new conversation with Dr. Tommy Wood on preventing dementia.

Podcast guest I'm remembering

"In Memoriam: Art De Vany." RIP, Art. You can listen to my conversation with him here.

Quote I'm pondering

"Our normal waking consciousness, rational consciousness as we call it, is but one special type of consciousness, whilst all about it, parted from it by the filmiest of screens, there lie potential forms of consciousness entirely different. We may go through life without suspecting their existence; but apply the requisite stimulus and at a touch they are there in all their completeness. … No account of the universe in its totality can be final which leaves these other forms of consciousness quite disregarded."
— William James

You can complement this edition of 5-Bullet Friday with my recent conversation with Dr. Dominic D'Agostino on how to use ketosis for enhanced mood, cognition, and long-term brain protection, plus my latest keto experiment.

And, as always, please give me feedback on X. Which bullet above is your favorite? What do you want more or less of? Other suggestions? Please let me know. Just send a tweet to @tferriss and put #5BulletFriday at the end so I can find it.

Have a wonderful weekend, all.

Much love to you and yours,

Tim

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Friday, January 30, 2026

5-Bullet Friday — Beating Lyme Disease, Shawn Ryan, Finicky Blood Tests, and Art De Vany