A Health Promoting Schools (HPS) program was conducted among primary and secondary school children in Southern Province, Sri Lanka. The HPS program included implementation of health education and workshops, as well as publication of school newsletters that communicated the material the children discussed and learned in school to their families. The study aimed to determine whether the HPS program had any effects on the health of the school children, their parents and teachers. A total of 22 adults (nine parents, nine school teachers, and four school principals) were invited for in-depth individual interviews and reported their views on changes after the implementation of the project. The interviewees reported that the school children substantially improved their behaviors regarding dietary habits, basic hygiene, lifestyle, and exercise. They also expressed that the school environment improved. They indicated direct and indirect changes in their own awareness and attitudes, as well as in other family members. After the implementation of the HPS program, improved health behaviors and subsequent improved health across two generations were observed. Beyond providing students with health knowledge, more emphasis on motivating children to spread their health knowledge in their communities will make a more effective health intervention.