"The Metabolic Approach to Cancer" is based on Otto Warburg's theory that cancer is fuelled by a high carbohydrate diet, which he introduced to the Western world. Dr. Winters built up on this theory and followed the research proving that glucose is a primary energy source for cancer cells. In her book, she shows that the ketogenic diet could be the answer for cancer patients when it comes to what they eat. She also talks about how low-glycemic foods, like animal products and some plants, can help with the 10 main causes of cancer.