The purpose of the study was to identify the effect of lifestyle and eating habits on the level of physical activity of adolescents. Participants consisted of 264 middle and high school students in public schools in Sabia province, and they were aged from 15-18 years old. The Questionnaire (IPAQ) was utilized as the assessment tool to measure the level of physical activity and lifestyle of students.

The results of the study showed that above (48%) of the participants were overweighed and the rate of none smokers was (85.6%), and (57.8) of the participants did not have any health problems.  As well as significantly higher rate of physical activity was ranged from high to moderate intensity (3.83%, 75%) respectively. One-third of the participants engaged in high-intensity activities for more than an hour, and only about 17.4% did moderate-intensity activities for more than an hour. However, the days of moderate to high-intensity physical activity (3-5 days) or more per week were less than expected, and nearly half of the participants stay sitting for more than two hours. As for the nature of eating habits among the participants, the results showed that about (45.5%) committed to the times of eating basic meals in some cases. The rate of intake of milk and dairy products, fruits and vegetables during the main meals were not within the appropriate range for most of the sample of the study. The results also showed that (47.7%) regularly eat three meals per day. The percentage of those who referred to eating snacks between the main meals from once to twice daily were (70%), juices followed by fruits and vegetables were the most favorite snacks. The results of the study indicated that more than (95%) of the participants consumed fast food weekly, and participants indicated that sitting for watching TV habits encouraged the habits of eating, which contributes to weight gain.  The intake of soft drinks, tea and coffee were (96.2, 93.9%) respectively, while (66.7%) of the participants consumed energy drinks. In the light of the results of the study, we conclude that the increasing indicators of public health risk among adolescents are high in relation to weight gain and decreased hours of physical activity participation, sedentary, prevalence of unhealthy eating habits, and increased consumption rates of soft drinks and energy drinks.

The recommendations for practitioners who deal with this category in education settings are to find urgent solutions that contribute to health awareness regarding the active lifestyle, the choice of healthy food, and Intensifying research, more longitudinal studies related to the health and safety of all members of Saudi society.