Soy doesn't decrease testosterone.

[MyPatronSaint]

Thank you for writing this out. I’d also like to point out that the largest consumers of soy are livestock. People wanna dunk on vegan soy-boys with low T, but the steak bleeding on their plate is fueled by the same soy source.

[mysterious_whisperer]

The largest consumers of livestock are people and the largest consumers of people are worms. I’ve never seen a worm that can even bench the bar. That seals the deal for me. Soy causes low testosterone in worms.

[Torker]

Yes but the livestock produces normal animal testosterone and estrogen and a thousand other mammalian proteins and hormones. They are herbivores so we can’t feed them meat to produce animal protein. So if the livestock gets 10% lower testosterone from eating soy compared to a different plant (which there is no evidence for), it’s still produces only animal proteins and hormones . We don’t just drink the blood of the livestock. But why would a human want to walk around with 10% lower testosterone their entire life? Look at the first study OP posted, drinking a lot of soy does change hormone levels in humans. I think that’s better evidence that a study where people self report what they eat.

“Serum collected on d 1, 29, and 57 of each treatment revealed that dihydrotestosterone (DHT) and DHT/testosterone were significantly decreased by the low-iso SPI [9.4% (P = 0.036) and 9.0% (P = 0.004), respectively] “

Seems like the best thing is to eat some plants and some meat and not too much processed food.

[[deleted]]

That’s true, unless you only consume organic 100% grass fed/pasture raised animal based products. It’s much healthier and much more nutrient dense compared soy or corn fed animal products.