You are volunteering at a high school, with a program aimed at reducing obesity risks among students. The community leader pairs you with a boy who has obesity (BMI over 30). Your job is to investigate the causes of his obesity and risk factors for diseases associated with his obesity and provide him with a plan of action for reducing his weight and improving his health. When you meet with him for the first time, he tells you that his family does not have a car and they live far from any grocery stores or produce markets. The only store within walking distance is a convenience store; he frequently stops there on his way home from school and buys frozen burritos and candy bars. Which term best describes this barrier to health