Background: The term adolescence is derived from the Latin word „adolescence; meaning “to grow, to mature” It has been defined by the World Health Organization (WHO) as the period of life from 10 to 19 years and is characterized by rapid physical growth, significant emotional, psychological and spiritual changes; and evolving personal relationships. Objectives: To study the physical activity levels and dietary patterns of adolescents in Ghaziabad district. Methods: A School based epidemiological study was conducted among 552 adolescents (11- 15 years age group) in urban areas of district Ghaziabad. Multistage sampling technique was used to cover the sample size for present study. A pilot study was carried out in a higher secondary school other than the selected areas for the actual study to test the study schedule. Results: Out of the 550 adolescents, the nutritional status of 334 (60.72%) was in the normal range, 60 (10.9%) were underweight and 156 (28.36%) were overweight or obese. Majority of the adolescents had a moderate level physical activity. Among the adolescents with low level of physical activity, majority (74.3%) were females while 25.69% were males. majority consumed 1 serving of fruits and vegetables per day. Majority ate fast food/outside meal food 1-2 times a week.