Dr. Daniel Amen

I love your brain.

It's the only organ in your body where size really does matter.

It's your brain because it controls everything.

Size does matter?

Size matters.

You don't want a smaller brain.

And alcohol, marijuana, being overweight, they all decrease the size of your brain.

Yeah, horrible study.

Out of the University of Pittsburgh, my friend Cyrus Raji published it.

He looked at MRI scans of people who are healthy weight, so BMI between 18.5 and 25, overweight 25 to 30 BMI, or over 30, obese.

The people who are overweight had 4% less volume in their brain, so less brain tissue, and their brains looked eight years older than they were.

How does that work?

The people who were obese had 8% less volume.

Think about that.

And their brains look 16 years older.

I looked at my healthy group that...

We have it among clinics.

And because when we were looking at healthy, we weren't looking at weight.

And after that study came out, we saw exactly the same thing.

And then I did a big NFL study and I looked at my healthy weight NFL players and my overweight NFL players.