It's no secret that an individual's diet can affect her health and energy levels for good or ill. With the range of available food options currently available, however, it isn't always easy to know what to eat or in what combinations. In this detailed and accessible guide, two nutritional experts outline the foods and nutrients the human body needs to function optimally, and describe how each affects an individual's general well-being. They also discuss especially healthful food combinations and list combinations to avoid. In answering questions such as Is it possible to completely eliminate animal proteins from a diet? Which vitamins are essential to brain health? and What are the signs of a vitamin deficiency?, this handbook illuminates the bath toward more energy, a better memory, a heightened ability to focus, and an overall feeling of physical well-being.