The study looked at what makes people want to buy fast food, focusing on attitudes, norms, and control. They also checked how health concerns affect these factors. They surveyed 473 young people in Malaysia who eat fast food. Results showed that attitudes and norms influence buying fast food, but control doesn't. Health concerns make attitudes less important but strengthen the impact of norms on buying fast food. Control isn't affected by health concerns. This helps fast-food businesses understand consumer behavior, especially among health-conscious young people.