Dr. Peter Attia

And it looks like it's algebraic. This is incredible. It's easier for me to think about these things graphically than to think that it basically shuts off at about eight hours. So I'll give some more physiology.

And it looks like it's algebraic. This is incredible. It's easier for me to think about these things graphically than to think that it basically shuts off at about eight hours. So I'll give some more physiology.

And then we checked the first... Sorry, dumb question. Why didn't they just measure the ejaculate? Why did they have to biopsy the testes? I'm not sure. They just wanted to know about spermatogenesis, but we didn't want to biopsy the testes. They actually wanted to torture the guys, but...

And then we checked the first... Sorry, dumb question. Why didn't they just measure the ejaculate? Why did they have to biopsy the testes? I'm not sure. They just wanted to know about spermatogenesis, but we didn't want to biopsy the testes. They actually wanted to torture the guys, but...

So let's now define infertility. We've been using this term quite a bit. I suspect it actually has a formal definition. It's one year of inability to conceive after sex, using sex.

So let's now define infertility. We've been using this term quite a bit. I suspect it actually has a formal definition. It's one year of inability to conceive after sex, using sex.

When someone shows up in your office, is it usually after they've gone down the rabbit hole of troubleshooting the female partner, or are people doing this in parallel?

When someone shows up in your office, is it usually after they've gone down the rabbit hole of troubleshooting the female partner, or are people doing this in parallel?

Okay. Let's talk about your workup. What do you do when a guy comes in and what are the things you want to know about him? So getting a guy in is great.

Okay. Let's talk about your workup. What do you do when a guy comes in and what are the things you want to know about him? So getting a guy in is great.

Can you explain what that, we haven't talked about how a vasectomy works and why a guy still ejaculates, but is infertile. Explain what the vas deferens, how the whole thing works in the plumbing. Right. So we didn't answer that question, which was what's the semen consist of?

Can you explain what that, we haven't talked about how a vasectomy works and why a guy still ejaculates, but is infertile. Explain what the vas deferens, how the whole thing works in the plumbing. Right. So we didn't answer that question, which was what's the semen consist of?

And it gets forced out with muscular contractions in seconds. Yeah. So therefore, if the vas deferens is clipped... you're getting essentially 90% of the volume. You're just missing the 10% of the volume that contains the payload.

And it gets forced out with muscular contractions in seconds. Yeah. So therefore, if the vas deferens is clipped... you're getting essentially 90% of the volume. You're just missing the 10% of the volume that contains the payload.

So physical exam, do you need an ultrasound? How are you able to detect if a person is congenitally missing a vas deferens? Pure physical exam. What, you feel it? Mm-hmm. Interesting.

So physical exam, do you need an ultrasound? How are you able to detect if a person is congenitally missing a vas deferens? Pure physical exam. What, you feel it? Mm-hmm. Interesting.

What percentage of men are congenitally missing their VAS? One in 500. One in 500, okay.

What percentage of men are congenitally missing their VAS? One in 500. One in 500, okay.

Okay, so what's the Venn diagram of cystic fibrosis and congenital lacking vas deferens? The genes for that were discovered.

Okay, so what's the Venn diagram of cystic fibrosis and congenital lacking vas deferens? The genes for that were discovered.