Professor Tim Spector

Fermented food is any food that's been transformed by microbes into something better, which means it tastes better, it's more complex, it lasts longer, so you don't need a fridge.

That's why our ancestors did it.

And it's been chemically transformed and is generally more nutritious now.

So yogurt from milk.

All you're doing is adding... Zero fat.

Oh, I never have zero fat Greek yogurt.

Why do you want to drink that?

I don't know.

I just, I was just... No.

No?

That means it'd be heavily processed.

You don't want that.

But there's still good microbes in it.

And, you know, all you're doing is transforming something rather average like milk, which

Adults don't really need, it's not particularly beneficial milk.

And just by adding the microbes to it, you make it something healthy for the body.

And that's now been shown by...

It says zero-fat, so that sounds like it's... Well, we need fats to live, so fat is good.

And in fact, just a few days ago, the USDA have changed all their guidelines, which used to be about saying don't have fat and have low-fat products, to saying actually fat is good.

All that advice...