Aim. To observe and evaluate the health behaviour in school aged children and to get key insights into the health related behaviours of young people. Objectives. To analize and evaluate health behaviours among boys and girls in Pakistan. To analize and evaluate health-risk behaviors among boys and girls in Pakistan.To compare health behaviours of adolescents in Pakistan and Lithuania. Methods. Health Behavior in School aged Children (HBSC) questionnaire was used in this study. Questionnaire survey was carried out in 2 schools of Pakistan. One school was private and one school was public. The were 300 participants and majority of them were 14 and 15 years old. Health behavior was measured with questions concerning adolescent’s nutritional habits (breakfast, fresh fruit and vegetable, sweets, fast food and soft drinks with sugar consumption), health-risk behavior (cigarette use, injuries) and physical activity. Statistical data was analyzed using the statistic package SPSS 15.0 for Windows. Results. Two thirds (78.5%) of respondents thought they are in good health and just 4% claimed having excellent health. Study results showed, that 41% of school students exercise 2-3 times a week and 7.3% less than once a month. It was estimated that more than half of Pakistan adolescents eat breakfast every day on weekdays, but on weekends less than one third have breakfast at home. One third of respondents stated, that eat fresh vegetable and 20.1% of then eat fresh fruit every day... [to full text] / Santrauka.