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Weekly · Sunday Morning

Five longevity claims.
Worth your time.
Every Sunday.

Last Sunday

Rapamycin extends mouse lifespan 9–14%
NAD+ precursors reverse aging in humans
Blue-light glasses improve sleep quality
Walking 10 min after meals blunts glucose
Verdict change — caffeine half-life downgraded

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Change These Phone Settings NOW — Whalespan

Content›Video›Change These Phone Settings …

Change These Phone Settings NOW

Bryan Johnson11m · 2025-09-26

Claims Made

21

Claims Supported

21

Support Rate

100%

Support rate

21 of 21 claims supported

21 supported0 partial / not

Claims from this content

21

✓Well SupportedSmartphone proximity when turned on has negative effects on sperm quality, separate from heat effects.✓Well SupportedScreens should be turned off 60 minutes before bed to avoid withdrawal symptoms and anxiety.✓Well SupportedSmartphone heat can diminish sperm quality by altering testicular temperature.◐Partially SupportedPhones can have 10 times more bacteria than toilet seats, necessitating daily cleaning with microfiber and 70% alcohol.✓Well Supported

More from Bryan Johnson

Bryan Johnson's Blueprint Rapamycin Protocol

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AV

A. Volkovreader

4h

Bookmarking — the dossier-vs-overview split is the right call. Most of the time I want overview; sometimes I want receipts.

NP

N. Park

2d

Would love a "what would change this verdict" RSS feed. Sign me up if it exists.

Staring at blue light from phones suppresses melatonin and spikes cortisol, making it harder to fall asleep and reducing sleep quality.

✓Well SupportedChanging phone screen color to monochrome can reduce usage by 11% within one week.

◐Partially SupportedActivating red light mode on iPhones eliminates blue light and is helpful for checking the phone at night.

◐Partially SupportedActivating night shift or Android bed mode shifts blue-enriched light to warmer tones to preserve melatonin.

◐Partially SupportedThe 20-20-20 rule is a defense against digital eye strain.

◐Partially SupportedTilting the neck at 45 degrees while holding a phone increases the load on cervical discs from approximately 10 lb to 49 lb, and doing this routinely caused a 46% increase in reported pain.

◐Partially SupportedEstablishing phone-free zones and keeping the phone charger outside the bedroom can prevent doom scrolling and improve sleep.

◐Partially SupportedListening to sound at 90 dB reduces safe listening time to 4 hours per week, and 15 minutes of exposure at 100 dB can cause hearing damage.

◐Partially SupportedEliminating all phone notifications reduces addictive and compulsive phone use.

◐Partially SupportedAddictive behaviors related to phone checking predict mood disorders like depression.

◐Partially SupportedPhone snubbing reduces relationship satisfaction by 9% and increases conflict and jealousy.

◐Partially SupportedAdding friction to app access can reduce usage.

◐Partially SupportedAuditing screen time and identifying high-usage apps can help reduce overall phone usage.

◐Partially SupportedEliminating all notifications except for essential contacts and Bryan Johnson's YouTube notifications can lead to feeling calmer within one week.

◐Partially SupportedExcessive phone use is detrimental to health and well-being, and phone companies design addictive applications for profit.

◐Partially SupportedThe mere presence of phones, even when off, can cause brain drain, necessitating scheduled phone-free times.

◐Partially SupportedApps like Opel and One sec can help manage addictive mobile application engagement.