Hello, I've just nipped in before your BBC podcast starts to tell you all about

You're Dead to Me. We're the comedy podcast that takes history seriously, also from the BBC

and presented by me, Greg Jenner. I should have told you that at the beginning, sorry.

Anyway, like many other BBC podcasts, such as Desert Island Discs, Evil Genius, or In Our Time,

your Dead to Me is available first on BBC Sounds, a whole month earlier than anywhere

else in fact. So if you can't wait another day to hear the very latest in history and loads

of other good stuff, then listen first on BBC Sounds.

Hello, this is the food chain from the BBC World Service. I'm Ruth Alexander. In this week's program, we're going to explore how what you eat could reduce your risk of developing dementia now.

You can change the cognitive trajectory at any time in life. It's never too early, it's never too late.

As we heard last week, it's a syndrome that has a devastating effect on individuals and those close to them.

It was heartbreaking and you could almost see her sort of wasting away in front of your eyes.

That's really difficult to watch.

The World Health Organisation says close to 60 million people are living with dementia, and there are 10 million new cases every year.

Joining me are three guests who've all been exploring the potential for diet to help prevent it.

Professor Christy Tangney of Rush University's System for Health in the United States.

She co-created the Mind Diet.

Anne-Marie Minnehan, Professor of

Nutrition and Genetics, or Nutri-Genetics, as it's known, at Norwich Medical School at the

University of East Anglia in the UK. And Dr. Lizette Kean, a dietitian in Pretoria, South Africa.

I began by asking Anne-Marie, what dementia is exactly?

Yeah, it's a good question, actually, because the terms dementia and Alzheimer's disease are often

slightly confused and kind of used interchangeably. Dementia is kind of an umbrella term for a set of

...