Forty years ago, singer Olivia Newton-John poured herself into black leather pants and danced around in "Grease." Now, age 63, and a breast cancer 'thriver, ' she is still the picture of health and well-being. If you were wondering how she's managed to look so good through all these years, wonder no more.The secret of Newton-John's success is no secret at all. She exercises daily and eats a very thought-out diet based mostly on vegetables, fish, and whole grains. Newton-John firmly believes that what we eat is imperative to staying healthy and well-balanced and she shares this philosophy in her first book, "Livwise."Recipes in "Livwise" have been put together using Newton-John's own experience in the kitchen and with the help of nutritionists and chefs from Gaia, her Australian health retreat. The resulting meals are imaginative, tasty, and very healthy. For example: poached eggs with coriander pesto for breakfast, lunch of chickpea patties and a carrot salad with papaya and orange dressing, and dinner of trout with cauliflower puree and lime balsamic dressing. The common thread throughout these recipes is the food philosophy behind them and the mutual respect for the importance of eating a healthy, balanced diet along with regular exercise, to help your body find its own natural balance.