Vegetables and fruits with diverse natural colours contain abundant functional phytochemicals such as carotenoids, anthocyanins and betalains. Additionally, these phytochemicals also contain vitamins, essential amino acids, unsaturated fatty acids, minerals, food enzymes and other plant components. This book describes the relationship of evidence-based functions and mechanisms of the phytochemicals in vegetables and fruits, and foods including cereal crops, nuts, beans, seafood and others. Research has been found that a higher intake of fruits and vegetables has been epidemiologically associated with an improvement of and lower risk and treatment for many diseases such as cancer, hypertension, diabetes, osteoporosis and others.