Bollywood actress Shilpa Shetty known to be disciplined about her fitness regime is writing a book on health and nutrition. The book which Shilpa has been working on for the past 7 months will highlight everything that the 39-year-old actress has learnt so far about fitness and living a healthy life. 'I am writing a book on nutrition and health. All what I have learnt so far I am going to put that in the book. It's all in the mind. You have to train your mind to lose weight. You have to make a lifestyle modification. With a positive