Objective(s): The purpose of this study is to find out the relationship between some of the sociodemographic characteristics with anthropometric (BMI), achievement, and eating habits of high school students. Methodology: The study applies quantitative design, a Descriptive cross-sectional study. The study was initiated on (November 1st, 2021 – August 9th, 2022). The study was carried out in High School in Rania City. We select a random sample of one class in each high school, and we interviewed (246) students in 11 different high schools. Results: show near the three-quarters percentage of females (71.1%) is higher than the male percentage (28.9%), while near half of them are 17 years old (43.5), 16 years old (39.4%), 18 years old (13.4%), and a lower percentage is 19 years old (3.7). The economic status of near half of students is barely sufficient (48.4%), sufficient (47.2%), and only (4.5%) students are insufficient. Results show that one-third of the students failed the first round (32.9%), and more than two-thirds passed (67.1%). Near a quarter of the samples are underweight (18.7%), and near a quarter of students are overweight and obese (17.5%). These research findings show no significant correlation between academic achievement and body mass index. Shows a significant relationship between skipping breakfast and gender, and between physical activity levels and students’ academic achievement. Conclusion: The results of the study showed that skipping breakfast affects students' weight, causing weight gains such as overweight and obesity. Also, female students are skipping breakfast more and have better academic achievement than boys. The findings indicate that increasing levels of physical activity of students have a positive effect on their academic achievement.