Love and kisses were in the air when London’s fashion cognoscenti crammed into Stella McCartney’s Central London boutique to celebrate the academy award nominated documentary Food Inc. The film, about the upsetting, unsettling process food follows on its path to your plate, has been championed by the designer, who has long been on PETA’s good side, for swearing off the use of fur in her designs, and whose mother, Linda, was an animal rights activist and vegetarian. McCartney was joined by the director Robert Kenner and co-producer Eric Schlosser, who also wrote Fast Food Nation, and a gaggle of guests chomping on mini burgers and veggie chicken sticks, courtesy of Linda McCartney's food line, organic cake and wine. BlackBook caught up with the designer at the party, on the eve of London's fashion week, to discuss the movie, her dad and having more children.

Why have you put your name behind Food, Inc. to the extent that you hosted the British Premiere of the film? Obviously my mother would have been very saddened the way things have turned out with how we produce our food, so that's why I feel so motivated by the issues. We're not moving forward in a very positive way. It seems that money really is the root of all evil. It's scary how the food industry is so intertwined with politics. I guess my mum would have been disappointed with how things are. Once you've seen the film, you'll hopefully be educated to know how to make responsible decisions about what you buy. Because at the end of the day, the biggest way to let these corporations know you don't want this product and deserve a better product is by stopping demand.

Obviously you are luckier than most and can afford to eat organic food. What would your advice be to those low-income families who cannot afford to? I would say just try to avoid the big suppliers of food. We can, as the people, make a change. We can do that.

What aspect of the film were you most shocked by? It's just the globalization of the food industry and how there are only five major players that provide all the food. That’s kind of terrifying. I decided to host the premiere of Food, Inc. because it’s the kind of film everyone should see and it’s information everyone should have. Food, Inc. is an "Inconvenient Truth" for food and we hope the film will empower consumers to help effect change. Just by watching it I felt I had done something for not only myself, but my children as well.

Has it really had that dramatic affect on you? It really is the most incredible film I’ve ever seen and everyone should see it. Once you've seen this film, you'll hopefully be better educated to know how to make responsible decisions about what you buy.

Will you be urging your Dad to see it? Of course. That reminds me I need to vote for him as he is up for a couple of music awards like best ever live performance. I know sounds strange, but I'll still be voting for him.

Would you think twice now about bringing more children in to the world? Well, I’m kind of interested in having more children. Though right now I feel like I’ve only just stopped having them, so I’m ready to have a bit of a break first.

Is it hard balancing being a full time fashion designer and mother? I think you’re allowed to be a working mum. You just have to strike the right balance. Look at some one like Vivienne Westwood. She's done it. And continues to make amazing clothes. I hope Vivienne never retires. She's my inspiration.