Obesity is a global public health problem of crucial importance. Obesity rates remain high in high-income countries and are rapidly increasing in low- and middle- income countries. Concurrently, the global consumption of unhealthy products, such as soft drinks and processed foods, continues to rise. The ongoing expansion of multinational food and beverage companies, or 'Big Food', is a key factor behind these trends. This collection provides critical insight into the global expansion of 'Big Food', including its incursion into low-and-middle income countries. It examines the changing dynamics of the global food supply, and discusses how low-income countries can alter the 'Big Food'-diet from the bottom-up. It examines a number of issues related to 'Big Food' marketing strategies, including the way in which they advertise to youths and the rural poor. These issues are discussed in terms of their public health implications, and their relation to public health activities, for example 'soda taxes', and the promotion of nutritionally-healthier products. This book was originally published as a special issue of Critical Public Health.