Sunlight & Testosterone: Why Levels Should Peak in the Summer
High Intensity Health with Mike Mutzel, MS
Mike Mutzel
4.8 • 1.2K Ratings
🗓️ 24 June 2023
⏱️ 17 minutes
🧾️ Download transcript
Summary
Studies show testosterone fluctuates seasonally, peaking in the summer months and declining in the winter.
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Key Takeaways:
02:35 Testosterone levels peak during August and September and decline in winter.
03:30 More sunlight and higher temperature correspond with higher testosterone.
05:15 Changes in melatonin byproducts impact testosterone.
06:05 Physical activity is a potent stimulus of testosterone production.
08:44 Chronic UV exposure, in animal models, increased levels of sex hormones and more sexual responsiveness in humans.
10:10 Tentacle tanning may work, but it needs study.
12:45 Lower disease risk and mortality in men is linked with higher testosterone.
13:00 Low fat diets decrease T in men.
14:40 Zinc, boron, vitamin D, and magnesium impact testosterone.
Transcript
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| 0:00.0 | So it's been long known that testosterone levels are on the decline in men and today |
| 0:03.6 | sure we're going to talk about seasonal variations into testosterone levels and how testosterone |
| 0:07.8 | should be peaking this time if you're into the early parts of the fall. I want to talk about |
| 0:12.8 | several different studies. We're also going to talk about a study finding that low fat diets |
| 0:16.0 | are linked with low testosterone. So let's dive into it. The first study we're going to explore |
| 0:20.2 | is titled seasonal variation into testosterone levels in a large cohort of men and this was |
| 0:25.3 | published last June in 2022. And what you can see here in this figure is testosterone levels peak |
| 0:31.2 | during the months of August and September and start to decline. Their lowest point occurs actually |
| 0:36.8 | in the near or the when the sun is at the lowest point during the time of year, which is February. |
| 0:41.8 | Implifying there is some sort of link with testosterone levels and sun exposure, which is how I was |
| 0:47.8 | able to figure out this article. I've been following this other related article we're going to talk |
| 0:51.6 | about today that was conducted in animal models, finding that UVB exposure from sunlight and sun |
| 0:57.8 | related light rays actually increases testosterone levels. And I highlight this because I see so many |
| 1:03.8 | people when I go hiking, when I'm outdoors, they're covering up, they're spraying sunscreen everywhere. |
| 1:09.0 | So technically they're outside, they're wearing sunglasses, they're really mitigating all the effects |
| 1:14.9 | of sun yet they wonder why they're deficient in vitamin D and have low testosterone levels. |
| 1:19.6 | So let's explore this connection with seasonal variation in hormone levels. |
| 1:25.4 | The scientists say in the current study that included a large cohort of men with a wide range |
| 1:30.0 | of age groups, body mass index and comorbidities, we found a significant association between the time |
| 1:35.5 | of year in which blood tests was performed and both total and bioavailable testosterone levels. |
| 1:40.8 | Furthermore, the month in which testosterone was measured independently associated with its level |
| 1:45.2 | in linear regression analysis that included other baseline characteristics that were found to |
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