There are nearly 7 million Americans living with Alzheimer's disease.

Chances are you probably know someone who's been affected by it.

It's the most common neurodegenerative condition in the world.

I've been reporting on this for more than two decades,

and any progress in the field has seemed incremental at best,

leaving most patients and their loved ones with few options.

But in the process of filming a recent documentary called The Last Alzheimer's Patient, I saw some

incredible signs of hope, meeting people all across the country who had been diagnosed

with or at high risk of the disease, and I saw

Alzheimer's, slowed, prevented, and yes, even sometimes reversed.

Importantly, it wasn't always about new expensive or experimental drugs, but lifestyle changes instead.

I know, it's hard to believe.

So I think you just need to hear it for yourself.

Here's part one of my documentary,

The Last Alzheimer's Patient.

I'm going to... I could use a strong cup of coffee. This is Chi Chi Zerbi and her husband John back in 2019.

Will you come see Grandma?

Take Grandma.

What do you owe?

Chi is best described as the matriarch of a huge, tight-knit family.

Yum, yum.

Oh, yum, yum. Oh, yum.

...