Mark Hyman, MD · 2025-06-18 · Andy Galpin, Mark Hyman (host)
The Real Reason You're Always Tired Has Nothing to Do With Sleep
32 claims checked against research: 2 contradicted 1 contradicted online 8 overstated 3 needing context 12 supported 6 unverified
6 No source found (not proven false)
Sleep regularity (going to bed and waking up at the same time every day) has a larger impact on perceived daytime energy levels than total sleep duration.
"Sleep regularity is more important than people think, meaning going to bed and waking up at the same time every day. When it comes to perceived feeling, your energy levels, that regularity will play a bigger impact than the total hours will." (said at 0:08:27)
No published record matching the claim that sleep regularity has a larger impact on perceived daytime energy levels than total sleep duration was located; this does not prove the claim false.
An overnight respiratory rate of 17 breaths per minute is elevated, especially in cardiovascularly fit individuals.
"You have overnight respiratory rate of 17 breaths per minute, which is high. This is not somebody who's cardiovascularly unfit." (said at 0:30:28)
No published record matching the claim that an overnight respiratory rate of 17 breaths per minute is abnormally elevated or specifically indicative of pathology in cardiovascularly fit individuals was located; this does not prove the claim false.
The traditional formula for maximum heart rate (220 minus age) was not derived from rigorous scientific trials, but was originally approximated informally on an airplane ride for a conference presentation.
"So your maximum heart rate, that number 220 minus your age, the story, the lore is that was actually written out on like the back of a sheet on a plane ride. So a couple of guys had to do a conference and they had to have some way to kind of present something, and they're just like, "Uh, 220," ran some numbers, like, "Yeah, that works out pretty well."" (said at 1:05:22)
No published record matching the claim that the traditional maximum heart rate formula (220 minus age) was originally approximated informally on an airplane ride for a conference presentation was located; this does not prove the claim false.
Overtraining and excessive physiological stress lead to marked reductions in circulating DHEA, total testosterone, and free testosterone.
"Stress response goes up when you're training too much. And every single time in that exact example, what do you think happens to DHEA pools? What do you think happens to total testosterone? What happens to free testosterone? HOST: They're plummeted, right? GUEST1: Yeah." (said at 1:18:24)
No published record matching the claim that overtraining and excessive physiological stress lead to marked reductions in circulating DHEA, total testosterone, and free testosterone was located; this does not prove the claim false.
Professional golfer Jon Rahm stopped using wearable sleep trackers like Whoop or Oura because the sleep tracking data was causing negative psychological issues.
"Some of our athletes, Jon Rahm, professional golfer, he's said this a bunch publicly, so I can say it. The Whoop or the Oura had to get taken off. The sleep tracking was causing issues with him." (said at 1:34:43)
No published record matching the claim that professional golfer Jon Rahm stopped using wearable sleep tracking devices (such as Whoop or Oura) due to psychological issues or anxiety stemming from sleep tracking data was located; this does not prove the claim false.
Detecting cancer at stage I or stage II yields a 5-year relative survival rate exceeding 95%.
"when you pick it up in stage I or II, it's over 95% survival at 5 years, which is, you know, basically a cure." (said at 1:43:14)
No published record matching the claim that detecting cancer at stage I or stage II yields a 5-year relative survival rate exceeding 95% was located; this does not prove the claim false.
Unverified means no publication matching the claim was located; it does not prove the claim false. Spotted an error? See the corrections policy - disputes from the people quoted are prioritized.