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Low fat diets decrease testosterone levels in men

"Low testosterone levels are linked to a higher risk of heart disease, diabetes, and Alzheimer's disease."


While I wouldn't call 40% fat high (since the maximum upper limit of human protein intake is <40%, hence how wolves became domesticated and how lean meat "rabbit starvation" occurs¹,²). Really this study is based on a 40/30/30ish inverted zone diet. 

Increased saturated fats (followed by mono), decreased polyunsaturated (Omega-6) fats (seed oils, especially oxidized fried foods), omnivorous diet, decreased carbs are all beneficial to male (and female) hormones (including insulin/glucagon and sex hormones) and thus weight and athletic performance. 

Stuff like this really starts to delve into how multifactorial neuro-cardio-metabolic disease is, weighing the pros and cons of chasing one set of metrics at the expense of all others. 

Medical Xpress: Low fat diets decrease testosterone levels in men.

https://medicalxpress.com/news/2021-04-fat-diets-decrease-testosterone-men.html 

¹ https://en.m.wikipedia.org/wiki/Protein_poisoning

² https://journals.humankinetics.com/view/journals/ijsnem/16/2/article-p129.xml  




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