United States Commission on Obesity Act - Establishes the United States Commission on Obesity which shall: (1) conduct research regarding the causes and treatment of obesity; (2) study the fast-food industry's influence on obesity and diet habits; and (3) engage in public education programs regarding the health and social effects of obesity and promoting exercise and diet as a means of preventing and controlling obesity. Authorizes the Commission to make grants to institutions of higher education or public or private research institutions to research the metabolic differences between obese and nonobese individuals and among ethnic groups and the acquisition of healthy diet habits and attitudes in young persons.