Family influence impacts health behavior primarily by shaping daily habits such as diet and physical activity. These behaviors are often learned early in life through family routines, modeling, and shared values, which can promote either healthy or unhealthy lifestyles. Families provide the social environment where eating patterns are established and physical activity is encouraged or discouraged. This influence directly affects risk factors for chronic diseases, making family a critical factor in preventive health. Unlike genetic factors or healthcare access alone, family-driven habits are modifiable targets for health interventions.

Reference: Health Behavior: Theory, Research, and Practice, Karen Glanz, Edition 5.