there are lot of papers (more than 30k) in pubmed with your topics (https://www.ncbi.nlm.nih.gov/pubmed/?term=obesity+young), just need to refine the search if you want.
The prevalence of severe obesity among children and young adults has increased over the past decade. Although the prevalence of cardiometabolic risk factors is relatively low among children and young adults who are overweight or obese, those with more severe forms of obesity may be at greater risk.