This document discusses herbs, foods, and phytochemicals. It defines herbs as green leafy parts of plants used for flavoring and medicine. Foods provide basic nutrition and physiological health benefits. Functional foods specifically provide additional health benefits. Phytochemicals are non-nutritive chemicals in plants that may prevent disease. Examples given include lycopene in tomatoes and allyl sulphide in garlic and onions. The document also covers bioactive components, classes of phytochemicals, and terminologies related to herb and food properties.