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Puberty is the period where each human has tense biological, emotional, social, intellectual and perceptional changes. These changes affect, inter alia, the adolescents' eating habits. The role of adopting and keeping the right nutritional behaviour through adolescence is confirmed and it's determined for a human's adulthood, too. The adolescent is influenced easily by exogenous and endogenous factors, which have as result his declination from the healthy models of nutrition, including the model of Mediterranean nutrition. The nutritional intervention by the internet seems to has a better correspondence on adolescents and there is hope to bring the desirable results, that is their nutritional behaviours and their compliance with the healthy models. The social networks are an integral piece of the humans' daily routine, which have so positive as negative effectst in different sections of the people' s life and especially on teenagers, which are in a transitional stage. This factor makes them the most vulnerable age group of social media, in many sectors of their life, including the nutritional sector, which is emerged by the role models which are shown in social media and the teenagers' desire to mime them. The searching part of the present assignment investigates the affection of social media on adolescents' nutrition, through the west models which they promote, so as the teenagers' nutritional habits and the time they devote to sporting activities. After that, it is investigated how much the usage of social media affects the teenagers' opinion about their body image, their self-esteem and their extent of sociability. It is, also, investigated if and how much they lead themselves on social comparison and finally the time they spend daily on social networks.