This unit places the study of nutrition issues and food habits within the sociological, cultural and political environment in which groups of people function and develop.  The major nutrition-related health issues that exist in developed and developing countries are examined in terms of vulnerable populations and sub-groups, and global food markets are considered in terms of practical and ethical solutions.  The knowledge and skills required for effective public health nutrition promotion, planning and implementation are addressed, and the particular place of public advocacy for nutrition is examined.