This week's stories: 

*Bartonella Hides in Cat Scratches — and It Might Be Why You Feel Like Garbage 

A stealth bacterial infection transmitted by everyday cat scratches and flea dirt has been quietly linked to chronic fatigue, brain fog, and neurological symptoms for decades. Dave breaks down how Bartonella slips past standard testing, why it's almost never on a conventional doctor's radar, and the specific PCR protocol you need to actually find it. 

Sources: 

• https://pubmed.ncbi.nlm.nih.gov/ 

*High Tyrosine Levels May Be Cutting Years Off Men's Lives 

A Mendelian randomization study of 270,000 UK Biobank participants found that elevated tyrosine is causally linked to nearly a full year of lost lifespan in men — with zero effect in women. The culprit appears to be an inflammatory oxidation pathway that men metabolize very differently. Dave examines what this means for every guy stacking L-tyrosine nootropics or eating high-protein keto. 

Sources: 

• https://pubmed.ncbi.nlm.nih.gov/41045493/ 
• https://www.aging-us.com/news-room/high-tyrosine-levels-linked-to-shorter-lifespan-in-men 
• https://www.usnews.com/news/health-news/articles/2026-02-27/study-suggests-one-common-amino-acid-may-affect-how-long-men-live 

*Blue Light Blocking Contact Lenses Are a Legitimate Vision Upgrade 

ALTIUS Vision's tinted contact lenses aren't just blue light filters — they cut chromatic aberration by 53% and improve motion tracking and contrast sensitivity in ways that software filters simply can't replicate. Dave covers the mechanism, who benefits most (screen workers, TBI recovery, gamers), and how to find a provider. 

Sources: 

• https://altiusvision.com/chromatic-aberration/ 
• https://altiusvision.com/science-of-altius/ 
• https://www.westvalleyvision.com/-altius--performance-tinted-contact-lenses 

*Taurine Plus B Vitamins Actually Moves the Needle on Motivation 

A randomized crossover trial found that a daily stack of taurine, B6, folate, and B12 sustained effort-reward motivation and cut cognitive lapses significantly compared to placebo — and the mechanism runs through glutathione production in brain astrocytes. Dave breaks down why this combo works when either ingredient alone doesn't. 

Sources: 

• https://pubmed.ncbi.nlm.nih.gov/41889717/ 
• https://www.frontiersin.org/journals/nutrition/articles/10.3389/fnut.2026.1711478/full 
• https://www.nutraingredients.com/Article/2026/03/23/taurine-and-b-vitamins-bost-motivation-and-focus/ 

*30 Seconds of Smelling Flowers Resets Your Nervous System 

Research out of the Monell Chemical Senses Center confirms what your grandmother knew: a slow, deep floral inhale measurably lowers heart rate and activates the parasympathetic nervous system — and it works because olfaction bypasses the cortex entirely and hits the limbic system directly. Dave makes the case for building a daily scent ritual. 

Sources: 

• https://time.com/ 
• https://www.southtabor.com/healthy-living-tip-stop-and-smell-the-flowers/ 

This episode is designed for biohackers, longevity seekers, and high-performance listeners who want mechanism-level clarity on infection-driven cognitive decline, amino acid optimization, sensory performance, and evidence-based supplementation. Host Dave Asprey connects emerging clinical research, Mendelian randomization data, and real-world protocols into actionable frameworks for extending healthspan and sharpening performance. 

New episodes every Tuesday, Thursday, Friday, and Sunday. 

Keywords: Bartonella cat scratch infection, Bartonella brain fog chronic fatigue, stealth bacterial infection biohacking, tyrosine lifespan men, L-tyrosine risk men longevity, Mendelian randomization amino acid aging, blue light blocking contacts, ALTIUS vision chromatic aberration, performance contact lenses TBI, taurine B vitamins motivation RCT, taurine folate brain health, glutathione astrocytes focus, smelling flowers heart rate stress, olfaction parasympathetic nervous system, floral scent limbic system, biohacking news, longevity research 2026 

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Resources:   

• Get My 2026 Clean Nicotine Roadmap | Enroll for free at https://daveasprey.com/2026-clean-nicotine-roadmap/ 

• Get My 2026 Biohacking Trends Report: https://daveasprey.com/2026-biohacking-trends-report/ 

• Dave Asprey's Latest News | Go to https://daveasprey.com/ to join Inside Track today.  

• Danger Coffee: https://dangercoffee.com/discount/dave15   

• My Daily Supplements: SuppGrade Labs (15% Off)   

• Favorite Blue Light Blocking Glasses: TrueDark (15% Off)   

• Dave Asprey’s BEYOND Conference: https://beyondconference.com   

• Dave Asprey’s New Book – Heavily Meditated: https://daveasprey.com/heavily-meditated  

• Join My Substack (Live Access To Podcast Recordings): https://substack.daveasprey.com/ 

• Upgrade Labs: https://upgradelabs.com    

Timestamps: 

00:00 – Intro 

00:37 – Bartonella & Cat Scratch Disease 

02:06 – Tyrosine & Lifespan in Men 

03:37 – Tinted Contacts & Visual Processing 

05:56 – Taurine & Motivation 

07:25 – Floral Scent & Nervous System Reset 

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