The first sentence assumes that poor diet is always associated with adolescents, this is incorrect, Better to say: Adolescents often do not consume a high-quality diet, concurrently their self- 13 reported mental health problems are increasing
Results. In Results, the separations of text and Figures and Tables is strange (when a paper does it, the trend is to include it at the end of all the paper). I recommend you to alternate them (text, Figures and Tables in Results). Nevertheless, results are well elaborated.