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Background: Investigating life-stage factors associated with overweight may be useful in the prevention of excessive BMI increase. The main aim of this study was to investigate the influence of the route of delivery, birth weight and overweight onset on overweight severity in a sample of overweight adolescents followed at a Pediatric Obesity Clinic., Methods: Clinical data from 412 adolescents with overweight (BMI ≥ p85), aged 10-18 were retrospectively collected and analyzed., Results: Adolescents born by cesarean section (CS) showed a lower age of overweight onset, compared to other methods of delivery (d= 0.33, p= .009). Birth weight was positively associated with BMI z-score (r=.164, p= 002) and waist circumference (WC) (r=.191, p=.001). The overweight onset was negatively associated with BMI z-score (r= -.277, p < .001), WC (r= -.270, p < .001) and body fat mass (r= -.199, p=.001). Overweight duration was the best predictor of BMI z-score, explaining in 75% its variation (F=1,317)=26.94, p < .001), which increased to 99% when birth weight was included in the model (F(2,316)=18.47, p < .001)., Conclusions: This study suggests that lifestyle may interrupt the burden of CS on BMI z-score throughout growth. Moreover, increased birth weight may anticipate overweight onset, and consequently overweight duration in the presence of inadequate lifestyle behaviors.

Motivational interviewing (MI) is an effective method to promote weight loss that can be delivered by non-mental health providers. The aim of this study was to evaluate whether MI was superior to conventional counseling to improve the anthropometric outcomes of adolescents with obesity/overweight. It was a controlled cluster randomized trial with parallel design in a school setting. The study included two groups: Motivational Interviewing Group (MIG) and control group (Conventional Intervention Group, CIG). Students participated in three face-to-face 30-min interviews, 3 months apart. Outcomes were BMI z-score, abdominal circumference, percentages of fat mass and muscle mass, and blood pressure. Sessions were coded with the Motivational Interviewing Treatment Integrity (MITI) manual. Mixed repeated-measures ANOVAs were used to assess the group versus time interaction. Effect sizes were calculated for each ANOVA with eta-squared measures (η 2 ). Eighty-three adolescents finished the protocol. While MIG participants showed a significant improvement in all anthropometric scores at 6 months, CIG participants showed an unfavorable change in those variables.Conclusion: Our results provide additional evidence of the short-term usefulness of a school-based MI intervention on anthropometric outcomes of adolescents with obesity/overweight, demonstrating that pediatricians can play an important role in the prevention and management of pediatric obesity.Trial registration: The study is called IMAGINE and is registered in Clinicaltrials.gov with the number NCT02745795. What is Known: • Although MI has been recognized as an effective counseling style for behavioral change in weight loss, there are few reports about the anthropometric outcomes of interventions with adolescents being treated for obesity/overweight. • Our study showed significant positive changes in anthropometric variables (BMI z-score, abdominal circumference, percentage of fat mass, percentage of muscular mass, systolic and diastolic blood pressure) after only three face-to-face sessions over 6 months. What is New: • MI delivered by non-mental health providers in a school setting seems to have short-term usefulness in a program aiming the treatment of obese/overweight adolescents.

The aim of this study was to compare the effect of motivational interview (MI) with conventional care on the depression scale scores of adolescents with obesity/overweight. It was a controlled cluster randomized trial with parallel design, including two groups: intervention group [Motivational Interview Group (MIG)], control group [Conventional Intervention Group (CIG)]., Intervention: three face-to-face 30min' interviews three months apart (only MIG interviews were based on MI principles)., Outcomes: change in Children Depression Inventory (CDI) scores. We used a mixed repeated-measures ANOVAs analysis to assess the group vs time interaction. Effect size was calculated for ANOVA with difference of means of the total score (DOMTS). CDI scores were compared by a paired t-test. Eighty-three (84%) adolescents finished the intervention. There was a significant time vs group interaction both groups. While in the CIG scores significantly increased, in the MIG the scores significantly decreased. The DOMTS was significantly different between the two groups. We concluded that MI showed a positive effect on depression scale scores over time relatively to conventional intervention., (Copyright © 2017 Elsevier Ireland Ltd. All rights reserved.)