Adolescent Obesity and Early-Onset Type 2 Diabetes

Area of Science:

• Public Health
• Endocrinology
• Epidemiology

Background:

• Type 2 diabetes (T2D) diagnosis is occurring at increasingly younger ages.
• Adolescent obesity is a growing public health concern with potential long-term consequences.
• Understanding the link between adolescent weight status and early adult T2D is crucial for prevention strategies.

Purpose of the Study:

• To investigate the association between adolescent obesity and the incidence of type 2 diabetes in early adulthood.
• To quantify the risk of T2D associated with different levels of adolescent obesity.
• To examine potential sex differences in this association.

Main Methods:

• A nationwide, population-based cohort study of 1,462,362 adolescents (mean age 17.4 years) from 1996-2016.
• Linking adolescent health data with the Israeli National Diabetes Registry to identify incident T2D cases.
• Utilizing Cox proportional models to analyze the association between Body Mass Index (BMI) percentiles and T2D risk, adjusting for sociodemographic variables.

Main Results:

• Over 15.8 million person-years, 2,177 individuals developed T2D (mean age 27 years).
• Significant interactions were observed between BMI, sex, and T2D incidence (Pinteraction = 0.023).
• Severe adolescent obesity was associated with substantially increased hazard ratios for T2D in early adulthood (e.g., HR 25.8 in men, 44.7 in women).
• Higher adolescent BMI inversely correlated with the mean age of T2D diagnosis.
• Projected fractions of adult-onset T2D attributed to high adolescent BMI (≥85th percentile) were 56.9% in men and 61.1% in women.

Conclusions:

• Severe adolescent obesity is a significant risk factor for developing type 2 diabetes in early adulthood.
• The increasing prevalence of severe adolescent obesity is projected to drive a rise in young adult T2D incidence in the coming decades.
• Public health interventions targeting adolescent obesity are critical for mitigating future diabetes burdens.