About this episode
In this episode, Greg and Lyndsey sit down for a discussion about cortisol with Beth Skwarecki, the senior health editor at Lifehacker. The dangers of high cortisol are a persistent topic of content on social media content, so the discussion focuses on the types of claims that are being made, the dubious methods of self-diagnosis and “treatment” being recommended, and the potential risks and dangers associated with letting social media convince you that you’re basically an endocrinologist. You can read Beth’s article on this topic here: TikTok Myth of the Week: All Your Problems Are Due to High Cortisol TIME STAMPS What is cortisol? (00:02:52) Epinephrine vs. Adrenaline Basic cortisol physiology Low cortisol and adrenal crisis 'Normal' cortisol levels (00:18:44) Reference range for normal cortisol Variability in cortisol awakening response Cortisol awakening response poorly associated with total daily cortisol AUC Early childhood stress (with family income as a proxy) associated with either elevated or depressed cortisol awakening response Cortisol discourse on TikTok (00:33:56) Representative examples of TikTok cortisol content: https://www.tiktok.com/@brittwd/video/7263934911432707374?_r=1&_t=8gQo2Q04An4 https://www.tiktok.com/@mallorymh/video/7242431357446556970 https://www.tiktok.com/@xomgitsbunnie/video/7272557452095376686 https://www.tiktok.com/@liv.ingwell/video/7263106370696695083 Cortisol vs other social media trends (00:47:48) The Endocrine Society on adrenal fatigue Representative examples of TikTok adrenal fatigue content: https://www.tiktok.com/@clairethenutritionist/video/6964559576985308421?_r=1&_t=8gY2Pf0iBPn https://www.tiktok.com/@begreatwithnate/video/7191220532862356778?_r=1&_t=8gY2YIPYDDG https://www.tiktok.com/@ambitiousandcaffeinated/video/7201977016571202821?_r=1&_t=8gY2fS0vaRP https://www.tiktok.com/@ghallfitness/video/7190694428586151170?_r=1&_t=8gY2uaAaGvS https://www.tiktok.com/@thewellnesswaylargo/video/7254966223329398058?_t=8gY34NUrjRO&_r=1 Cortisol and menstruation (01:07:41) Cortisol and trauma (01:11:32) Representative example of movements claimed to reduce cortisol associated with trauma Tapping: https://www.thetappingsolution.com/ Cortisol and exercise (01:15:55) Cortisol and overtraining (most notably, Figure 3 ) Impact of exercise intensity on cortisol response Cortisol levels return to normal very soon after exercise ends Hackney review on exercise and cortisol Specific claims about high cortisol (01:38:30) Cortisol, caffeine and sleep (01:45:39) Plenty of things cause you to wake up at night Spiritual meaning of waking up at 3AM Caffeine and cortisol Caffeine’s effects on cortisol are attenuated within 5 days of consumption Coffee intake is associated with plenty of positive health outcomes (hard to square with the idea that caffeine spikes cortisol in a manner that’s deleterious to your health) Real ways to regulate cortisol (01:55:49) Self-diagnosis (02:03:08) Cortisol disorders can cause real disease (story Beth referenced about woman with tumor) Other things that can cause Cushing-like symptoms Takeaways (02:08:13) Where to find Beth Check out Beth’s writing on Lifehacker Beth’s 510 Dinnie Deadlift Beth’s books: Outbreak! and Genetics 101 Follow Beth on Twitter MORE FROM THE SBS TEAM Work with a Stronger By Science coach : Get personalized training and nutrition plans and ongoing support from one of our expert coaches. Join the Research Spotlight newsletter : Our newsletter is the easiest way to stay up to date with the latest exercise and nutrition science. Join the SBS Facebook group and Subreddit . RECOMMENDED PRODUCTS Try MacroFactor for free : Use code SBS to get a 14-day free trial of our nutrition app MacroFactor. MacroFactor has the fastest food logger on the market and its smart nutrition coach adapts to your metabolism to keep you on track with your goals. Download it today on the App Store or Google Play . BulkSupplements : Next time you stock up on supplements, be sure to use the promo code “SBSPOD” (all caps) to get 5% off your entire order. MASS Research Review : Subscribe to the MASS Research Review to get concise and applicable breakdowns of the latest strength, physique, and nutrition research – delivered monthly.