The fundamentals of health science from a scientist's perspective. Health science and a better understanding of the science of health can help all of us minimize our risks of getting diseases such as cancer. Health science begins with genetics and environmental factors, and it may continue with the mind-body connection. A new field of epigenetics is described as a responsive interface that directly connects what we eat to what our bodies eventually become. Nutrition and exercise recommendations are provided for promoting healthy living and well-being. In addition, guidelines of health science are outlined which can assist the reader in achieving optimal health throughout life.