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I discovered Christopher Walker’s channel after researching Dr. Ray Peat and the importance of prioritizing your metabolism and thyroid for optimal health. Christopher’s channel is growing quite rapidly in popularity for those who seek out information about the subject. There have only been a few people online who have really expanded the knowledge of Ray Peat beyond the official online forum. In this video, Christopher discusses one of the negative effects of polyunsaturated fats.

Below is quoted information from the video:

High-PUFA Vegetable Oils Cause Low Testosterone

“The majority of the cooking oils used all around the world in this 20th century, are refined vegetable oils, aka. liquid oils extracted from plant sources, which are then processed in various ways.

To begin with, most of the vegetable oils are incredibly bad choices for cooking, due to their low smoke point, and the often used refining process (bleaching, deodorizing, degumming, etc) which strips them of micronutrients and can leave traces of sulfates.

Even if not used for cooking, but just as is, high-PUFA (polyunsaturated fatty-acid) vegetable oils are a disaster for your testosterone production.

There’s a well-done study from 1997, (412) which clearly demonstrates in human male subjects, how:

increased total fat intake boosts testosterone levels
increased intake of saturated fatty-acids (SFA) boost testosterone levels
increased intake of monounsaturated fatty-acids boosts testosterone levels
and increased intake of polyunsaturated fatty-acids (PUFA) reduces testosterone levels

Nearly all vegetable oils are LOADED with PUFA s (with the exceptions of coconut oil, palm oil, avocado oil, and olive oil because they’re all fruit oils).

What can make a PUFA vegetable oil worse, is if the polyunsaturated fatty-acids are mainly comprised of the dreaded omega-6 fatty-acids.

This is because the human body operates best if we keep the omega-3 (ω3) to omega-6 (ω6) ratio somewhere close to 1:1 or 1:2, which is near of that of the paleolithic human (the average American now has this ratio at 1:16, which is sixteen times more of the omega-6).

When the ratio of ω3:ω6 shifts more and more towards higher amounts of omega-6, the systemic inflammation and oxidative stress of the body keep on creeping higher and higher, this in turn DRAMATICALLY increasing your risk of multiple chronic diseases prevalent in Western societies. (413)

It’s very much likely that one of the end-results of high omega-6 intake would also be lowered testosterone production, and even though I didn’t find any studies about the subject, I did stumble upon a study (414) which shows that when the ω6 content of sper3 is high (and conversely ω3 is low), men are likely to be infertile. Whereas, when the ratio is more in favor of the omega-3’s, the subjects are more likely to be fertile and have high-quality sper3.

Bottom line: Dietary fat intake should be moderate-high for optimal testosterone production, and the amount of saturated fatty-acids (SFA), and monounsaturated fatty-acids (MUFA) should be prioritized. High-PUFA vegetable oils on the other hand, are a food that decreases testosterone levels and production. High-PUFA high- ω6 vegetable oils are a disaster.”

Download Christopher’s book Master Your T to learn how to boost testosterone naturally – https://umzu.to/myt28