Anorexia has become a concern over the past few years, with the NHS accused of "inadequacies", following the death of five women with eating disorders.
SoftBank has been investing in many companies around the world, including some that are already operating in Brazil such as U.S. office-sharing startup WeWork.
Protesters have targeted the airport before, occupying the arrivals hall, blocking approach roads and setting street fires in the nearby town of Tung Chung.