Dr. Rangan Chatterjee

My mother-in-law basically, I think, saw someone in their 70s doing it, and she literally came back and started joining her local 5k parkrun.

She thought, well, that person can do it, so can I. And then for a period of time, she was doing parkrun every week, which is 5k every Saturday.

So the whole idea that our beliefs have that much of an impact,

I think are absolutely massive.

This whole second power of beliefs, which is about anticipation, we can also, I guess, call it expectation, right?

That's right, yeah.

There was such a powerful example you shared about, I think was it Mr. A and the overdose.

So you just mentioned the placebo.

On that example, Nir, what do you think was going on?

Because you're making the case in the book that

The reason belief is so powerful when it comes to expectation is not because belief has a magical quality on our mitochondria, it's because the belief changes your action, right?

So, you know, if you believe you can get stronger and be really active and mobile in your 70s and 80s,

You're going to do more.

You're going to walk more.

You're going to go to the gym more.

You're going to go, yeah, I'm not slowing down because I'm getting older.

I know I can get strong as I get older.

But I guess the reverse is happening here, isn't it?

The guy hadn't actually taken the pill, yet his physiology was changing.

Yeah, for sure.