Background: Obesity among adolescent girls is a growing concern in India. It is particularly alarming as it is linked to a higher risk of illness and death during adulthood. This study aimed to investigate the effect of health education on lifestyle factors contributing to obesity among adolescent girls in a selected school in Karnataka.

Methods: The study used an evaluative approach employing a one-group pre-test and post-test design. The participants were 38 adolescent girls, aged between 14 to 16 years, who were selected using a non-probability purposive sampling technique from a private school in Bengaluru, Karnataka, India. Data on obesity was collected using a structured questionnaire, and an information booklet was provided to the participants. The post-test was conducted after thirty days using the same tool.

Result: A study of 38 adolescent girls found that 92% of them were unaware of the concept of obesity. Furthermore, a statistically significant correlation existed between the girls' knowledge of obesity after the study and their age group (p< 0.05). Additionally, the improvement in their knowledge levels from before to after the study was highly significant, with a P-value of less than 0.001.

Conclusion: Adolescent obesity is a major public health problem due to a lack of awareness about the risk factors for obesity. The information booklet has successfully increased the awareness level of adolescent girls on obesity, underscoring the crucial role that schools and the health system must play in this process. This highlights the need for a collaborative effort between educational institutions and the healthcare sector to educate adolescents about the risks associated with obesity and provide them with the necessary tools to make informed lifestyle choices.