I've been a vegetarian all my life. I've cooked meat but it has never passed my lips. My mum and dad were vegetarian, and my brothers. I don't know if I would have been if I wasn't born into it. But we were never forced.

I eat everything, I'm not fussy - as long as it hasn't got a face. Bacon does smell good to me, but then you've got veggie bacon and all that kind of stuff. I like beany pancakes: my mum used to make crêpes and put beans and cheese and tomatoes in the middle, that's the best. I like lasagne with veggie Quorn mince. I like to marinate the little Quorn pieces in all sorts of things, tomato sauces and onions, and you can put it in pitta bread with salad.

I started cooking for myself when I was young, Mum taught me. Then I started travelling and touring when I was about 15. When you're out touring Europe they don't understand what vegetarian means. 'You can eat chicken? No? How about some fish then?' So I'll have to eat pizza and sweets - it's bad. But I usually just have some bread in the dressing room, butter, some salad, and I'll make myself a salad sandwich.

They say singers shouldn't drink milk and be careful with dairy. But I drink tea with milk in it all the way up until I perform. When I'm onstage I drink a peppermint tea that has cayenne pepper in it, a little bit of honey, lemon. It's so spicy but it keeps me well - I think it keeps bacteria away. I can easily be sick - there's not much sleep on tour, and there's lots of travel - but since I found this tea last year, I've been well. So I do take spicy things: whenever I feel ill, I have a really hot veggie curry.

Some singers avoid a heavy meal before a performance but I eat whatever takes my fancy. I do eat less though - I don't want to feel bloated.

I don't often drink alcohol while I'm touring, because it dries your voice out. After the show I might have one beer. And that's only if I've got two days in between gigs. I don't really smoke much on show days. I smoke more when I go home to Devon, because I drink when I go home. A pint and a rollie: it just goes in hand-in-hand. I drink lager - I like Kronenbourg 1664 - lovely!

I'm definitely a chocolate fan. I told my mum I was gonna be in the new Flake adverts and she was like, 'OK, you have to ask for a lifetime supply of Flakes for your mum!'

In the advert, I just have to be myself: I have to go and write a song then I go into another room, singing the Cadbury's 'flakiest, crumbliest' thing. Then eat a Flake. It's kinda easy - I do all that anyway.

Dr John Briffa reviews Joss Stone's diet

Bean crepes

I'm generally a fan of beans: they provide some reasonable protein (which can be lacking in a vegetarian diet), and are a wholefood as well as a sustained release of sugar into the system. Crepe itself is not a great food, but the filling helps to make up for that.

Pitta bread

Bread has a tendency to disrupt blood sugar and insulin levels and generally comes up light in terms of nutrient content. To compensate I would over-stuff the pitta with truly nutritious fare, like the salad sandwich.

Cadbury's Flake

The main issue with this is its high refined-sugar content. On the other hand, the reason that this is the flakiest chocolate bar around is because what makes up a lot of its bulk is air.

Quorn

The main ingredient in Quorn is mycoprotein - derived from a mould organism (Fusarium venenatum) found in soil. Quorn has a healthy image on account of its meat-free, low-fat nature. I see Quorn as a processed and quite unnatural food, and of no great nutritional value.

Peppermint tea

Keeping adequately hydrated is not just good for the voice-box, but other parts of the body too. Water is my personal drink of choice, but herbal tea will do the job just a well.

Salad sandwiches

I'm no fan of most breads , but at least the nutritional content is improved here through the addition of some salad. Good fillings would be hummus and avocado, both of which will help provide her with some protein and beneficial fats.

Lager

Alcohol does tend to dehydrate the body. However, Joss's intake is moderate, and it seems she's well aware of how to ensure fluid levels remain topped up.