You're about to listen to a BBC podcast and maybe it's when I had a hand in.

I'm Tammy Walker and I produce podcasts for the BBC.

My role is to give new and diverse creators a voice with the opportunity to build a career.

That's the thing I love about podcasts.

You start with just a good idea, but then you have the space to see where it goes.

And doing that at the BBC means we can really run with the best stories

while developing the most unique audio talent.

So if you like what you hear, why not check out the huge range of podcast we've got on BBC Sounds?

Hello, you're listening to the BBC Crowd Science Podcast answering your questions about

everything from what makes us tick to what makes the universe hum. This week we're

looking at a subject close to many of our hearts.

Literally, it's fat.

I've brought you here to the BBC Canteen

because we've had this question from listener Mary Ann in the US.

To what extent is being fat, a matter of choice,

or self-discipline, something which a person should be expected to change.

Thank you very much, Marianne. Your question really struck a chord with me because like millions around the world

I'd like to lose a bit of weight myself and if you've tried that you'll probably have found out that it's very very hard.

I'm in the work canteen with Kathy, my producer, and some of the crowd science team

and it's lunchtime, so let's see what everyone has chosen to eat.

I'm eating your lunch money, which is great,

but I also have a span of copata and some salad.

...