"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-
Insider I'm not sure how everyone else is doing during Covid-19, the lockdown and gyms being closed, but I'm personally down 12+lbs. True, some of that is muscle since I can't lift, but a lot of it was excess fat. The fact is, gyms are not always utilized correctly, and people can do better by getting proper exercise in the real world. The best use of a gym is inclement weather, week nights during the winter, or short duration high intensity weight training. Spending your weekends and even your summer week nights at the gym is a terrible way to get exercise. Walking (walking briskly or with a weighted pack if you feel walking is too easy, is still one of the absolute best forms of exercise in terms of risk vs benefits), hiking (even better than walking, introduces instability and elevation and usually involves that weighted pack), biking (mountain, road, gravel, even indoors - if you must), swimming (you don't need a pool to swim, open water is fun and free)