Eric Topol

And there was another experiment you had with the rectal tubes where it was being used to judge transit time, right?

Tell us about that one.

Because that's not quite as wild, but still.

And the transit time varies from one person to the next, right?

I mean, if I eat some humongous salad, which would be a typical dinner for me, my transit time could, at least, would that largely be consistent from one person in a person?

Or could that even vary depending on all the other things that are going on?

Well, yeah, you start the book with a...

a person with two PhDs professor who doesn't look at their stool and then you mentioned of course this is this idea of not wanting it's so taboo you don't even want to look at it yeah uh but the point about this is really um the the appearance the so-called Bristol scale by the way

I don't like sausage.

I don't eat any meat.

And so Bristol 5, which is the soft-serve ice cream appearance, is a lot more, it sounds better than the 4, which is a sausage.

I don't know, but there's a whole range from Bristol 1 to, what, 10 or something?

7, that's it.

Yeah, yeah.

So that appearance is actually helpful because the healthy type of appearance would be in that kind of, what, 4 or 5 category?

Yeah, no, that's very helpful.

So, all right, so we've got kind of the three Ps, the myths, the gas story, amazing.

And, you know, one of the things I thought was really interesting, and this goes back to your high school days in the Intel competition.

is that the brain-gut story is fascinating.

And you did an experiment.