<![CDATA[Low learning concentration will have impact on low academic performance. This study aims to determine the relationship between learning concentration and several factors and to find the most dominant factor in the students of SMAN 1 Jember. In this study, learning concentration was the dependent variable, while breakfast habits, nutrient intake (energy, carbohydrates, protein, fat, iron, zinc, vitamin B12, vitamin C), sleep quality, and physical activity were independent variables. This research is a quantitative study with cross-sectional design. This study conducted in June 2021 at SMAN 1 Jember with a total of 200 respondents who were selected using the quota sampling method. Data were collected through filling out online questionnaires. The data obtained were analyzed using univariate, bivariate analysis using chi-square, and multivariate analysis using multiple logistic regression. The results show that 52.5% of the respondents had a high learning concentration. The results also show that breakfast habits (p=0,016), energy intake (p=0,037), carbohydrates intake (p=0,000), and sleep quality (p=0,020) are related to learning concentration among adolescents. The results of multivariate analysis showed that carbohydrate intake was the dominant factor associated with learning concentration in adolescents.]]>
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