Dr. Anne Truong explains how cortisol from stress suppresses testosterone production. Many men don't realize they're stressed, but wearables like the Apple Watch can catch it through elevated resting heart rate and dropped heart-rate variability, both signs you need to manage stress to protect testosterone.
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And I would tell you this is also stress management. When you have stress, you have high cortisol. When you have high cortisol, which is a stress hormone, that decreases testosterone. So cortisol up, testosterone down. Cortisol is released when you have stress. And how do you know you have stress? Most men don't realize they have stress, but most men actually stress, but they don't know that. How do you know you have stress? Oftentimes, it's increase in your heart rate. You wear an Apple Watch, you'll notice that your heart rate increase. And also, if you have Apple Watch, the more of the newer version, you'll see a change in your heart rate variance. So you have an increase in heart rate variance, it's heart rate and then variance, then you have more stress. But stress is a physiological response that your body respond to.