Increased incidence of obesity in adolescence causes the incidence of Metabolic Syndrome (Mets) also tends to increase. Various studies conducted in several countries prove it. Proven nutritional education can be one way to prevent the Mets incidence in adolescents. But before doing education about Mets in adolescents, it is necessary to know about knowledge and practice of adolescent behavior related Mets. So this research is done to explore it. This study used qualitative research with focus group discussion (FGD) method to understand in depth what is understood by adolescent about Mets component. FGD was conducted by 5 facilitators using the standardized FGD guidance. FGD participants consisted of 32 participants, with details of 9 men and 32 women. The procedure is performed through the analysis of the FGD results that have been done. The results of the analysis are described in the form of data description. To get a detailed picture of the theme studied, researchers enrich the knowledge by deploying the literature related to adolescents, balanced nutrition and adolescent. The results showed that most of the respondents still had low knowledge about the Mets component and nutrition guidelines. Their knowledge is still what is common in society. Most are still far from expectations. This study concludes that the adolescent knowledge and behavior about Mets are still very low so it needs to do education related to it to prevent the occurrence of Mets in adolescents.