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Obesity is a chronical disease, which leads to multiple short- and long-term complications. 4% of Swiss children and adolescents are obese. A prompt diagnosis and multicomponent lifestyle intervention is mandatory to avoid persistence of the disease into adulthood. Growth and BMI charts are still the essential tools to diagnose and define the etiology of obesity. A precocious and severe obesity, accompanied by hyperphagia, will raise the suspicion of monogenic obesity. The precise molecular diagnosis enables in some patients the use of a specific treatment. Leptine in case of LEP gene defects, or setmelanotide when the affected gene is part of the MC4R signaling pathway (LEPR, POMC, PCSK1)., Competing Interests: Les auteurs n’ont déclaré aucun conflit d’intérêts en relation avec cet article.

Polycystic ovary syndrome (PCOS) is frequent during adolescence (prevalence ≈ 6 %), and the prevalence increases in obese or type 1 diabetic (T1D) adolescent girls. During puberty, PCOS diagnosis is difficult because of the overlap with some pubertal physiologic signs. The 2017 international consortium suggests two required diagnostic criteria: persistent menstrual disturbances and hyperandrogenism. PCOS physiopathology is complex, including interactions between genetic, epigenetic factors, primary ovarian abnormalities, neuroendocrine alterations, hormonal and metabolic factors. Insulin seems to have a central place in obese or T1D adolescent girls. The treatment is still debated and should be monitored according to the main symptoms., Competing Interests: Les auteurs n’ont déclaré aucun conflit d’intérêts en relation avec cet article.

The prevalence of overweight and obesity among young patients increases with age, and affects one out of five at secondary school level. Ensuring continuous care of these young patients during their growth into adulthood is a true challenge, and requires a close collaboration of pediatric and adult care teams. Each step of this transition is precarious and needs specific attentions and competencies to be successful, as teenagers and young adults are simultaneously undergoing multiple changes and challenges. As each of these young patients present with their own individual development and life experiences, individualized care transitional care plans are necessary., Competing Interests: Les auteurs n’ont déclaré aucun conflit d’intérêts en relation avec cet article.