Introduction: Understanding the dietary habits and lifestyle choices of secondary school-going students is crucial for developing targeted health interventions. This study aims to analyze these aspects among secondary school-going students in Dhaka, Bangladesh, focusing on dietary preferences, physical activity, screen time, and sleep patterns. Methods: This observational cross-sectional study involved 600 secondary school students in Dhaka. Data were collected through structured questionnaires by assessing age, gender, BMI, dietary habits, meal frequency, water intake, fruit and vegetable consumption, fast-food and sweets intake, breakfast habits, physical activity, screen time, sleep patterns, self-perceived health status, and chronic health conditions. Bivariate correlations were analyzed to understand the relationships between these variables. Result: The majority of participants were 15 years old (37.83%), with more females (61.33%) than males. Most students were in grade 10 (77.67%), and the predominant BMI category was normal (54.67%). Dietary preferences showed a preference for a mixed diet (56.17%). Regular fruit and vegetable consumption was reported by 34.00% and 59.83% of students, respectively. High rates of fast food (23.00% regularly) and sweets (33.00% regularly) consumption were observed. Breakfast was often skipped by 15.50% of participants. Physical activity levels indicated that 45.33% engaged in physical training, but 19.67% were not involved in any sports. The average screen time was 2.42 hours, and the mean sleep time was 7.02 hours. Most students rated their health as good (61.17%), and 95.17% had no known chronic health conditions. Conclusion: The study highlights a mix of healthy and unhealthy dietary and lifestyle patterns among secondary school students in Dhaka. While there is a reasonable intake of fruits and vegetables, the prevalence of fast food and sweets consumption, combined with suboptimal breakfast habits and physical ..........