5-Bullet Friday — 79-Year-Olds Who Look Like 40-Year-Olds, Supplement Warnings, Beating Cancer, and Sawing Sawdust

"When you start worrying about things that are over and done with, you're merely trying to saw sawdust." — F. Fuller Shedd, as quoted by Dale Carnegie  ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏ ͏­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­­

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.   This edition is brought to you by ​Momentous Fiber+​, a 3-in-1 formula to support digestion, blood-sugar balance, and long-term heart and metabolic health. Be sure to see their offer in the P.S.   Short video I'm watching "Exercise Scientist Critiques the Most Jacked 79-Year-Old (Robby Robinson)." I must admit, Mike Israetel is hilarious. Don't discount him because of neck circumference. I've been quietly watching his videos over the last few months, and this Robby Robinson analysis showcases a lot of the reasons why.   John Connor prep that I'm doing "My lobster lost $450,000 this weekend." ​ ​"​​Man accidentally gains control of 7,000 robot vacuums." (Popular Science). (Original coverage: "The DJI Romo robovac had security so poor, this man remotely accessed thousands of them" for The Verge).   Scientific study I'm reading Some of you might recall my mention of the potential liver toxicity risks of 1,3-butanediol-based ketone supplements 6–12 months ago. 1,3-butanediol—sometimes abbreviated as 1,3-BD, BDO, or 1,3-BDO—is found in the majority of the most popular ketone supplements. ​ Even the monoester I've enjoyed refers to BHB bound to 1,3-BD. While I still occasionally consume it, I have strongly dialed back the dosages and frequency. I treat it more like a shot of moonshine and less like a nutritional supplement. ​ A new study was just published February 19th that further supports exercising caution: "Disparate Hepatic [Liver] Mitochondrial and Inflammatory Effects of Ketone Supplements." ​ As always, assume there is never a biological free lunch (read post here) and consider cycling off of your non-critical supplements periodically. All that said, speak to your doctor before changing any medications. Be safe out there!   X thread I'm reading "Going Founder Mode On Cancer." After surgery, radiation, and brutal chemo failed to stop his cancer's recurrence, co-founder of GitLab Sid Sijbrandij did what he knew best. In Silicon Valley's parlance, he went "founder mode," the term coined by Paul Graham to describe entrepreneurs who go deep and fully hands-on into a problem. Sid assembled a team, built a system of maximal diagnostics using cutting-edge, single-cell sequencing, and pursued 10+ experimental therapies in parallel, which included a radioligand treatment in Germany that most patients would never find. His cancer is now undetectable.   Passage I'm pondering "I have always admired a man like the late Fred Fuller Shedd, who had a gift for stating an old truth in a new and picturesque way. While editor of the Philadelphia Bulletin and addressing a college graduating class, he asked: 'How many of you have ever sawed wood? Let's see your hands.' Most of them had. Then he inquired: 'How many of you have ever sawed sawdust?' No hands went up. 'Of course, you can't saw sawdust!' Mr. Shedd exclaimed. 'It's already sawed! And it's the same with the past. When you start worrying about things that are over and done with, you're merely trying to saw sawdust.'"​ — How to Stop Worrying and Start Living by Dale Carnegie ​(Click to here to share on X.) You can complement this edition of 5-Bullet Friday with my brand-new podcast episode, in which I am in the hot seat and Dan Harris is the interviewer. ​ 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 ​ P.S. Deal of the Week — Momentous Fiber+​, a 3-in-1 formula to support digestion, blood-sugar balance, and long-term heart and metabolic health. Most Americans (~95%!) do not meet the recommended fiber intake. Fiber isn't just about "staying regular"; fiber is one of the most overlooked meta-nutrients for everyday health and fitness. In the last two years, fiber is one of the levers that I've revisited and pulled on the most. ​ It supports digestion, helps keep blood sugar stable, and feeds critical gut bacteria that affect nearly every aspect of life. Of course, I focus on whole foods first, but I also take quality supplements as cheap insurance for chaotic days, travel, and more. ​ ​Momentous Fiber+ makes it easy. It's designed to support your gut from multiple angles as a three-source blend: soluble fiber, insoluble fiber, and resistant starch. It mixes smoothly into water, smoothies, oatmeal, or yogurt, and it comes unflavored or in a natural cinnamon. No fillers, no sludge. Like every Momentous product, Fiber+ is NSF Certified for Sport®, which means it's independently tested. What's on the label is what's in the product. If you're dialing in your nutrition but lacking fiber, this is a simple fix. Get 35% off your first subscription with code TIM at LiveMomentous.com/Tim.   Forwarded this message? Sign up here. Join millions of monthly readers. Get exclusive content, private Q&As, giveaways, and more. No spam, ever. Just great stuff.   Sign Up   Listen to The Tim Ferriss Show Podcast The Tim Ferriss Show is one of the most popular podcasts in the world with more than one billion downloads. 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