Development of Distinct Body Mass Index Trajectories Among Children Before Age 5 Years: A Population-Based Study

Area of Science:

• Pediatrics
• Public Health
• Epidemiology

Background:

• Childhood obesity prevalence has risen significantly over the last three decades.
• Understanding the long-term impact of early body mass index (BMI) trajectories is crucial for public health interventions.

Purpose of the Study:

• To investigate how childhood body mass index (BMI) trajectories influence the risk of developing obesity later in life.
• To identify critical age windows for intervention to prevent childhood obesity.

Main Methods:

• Utilized medical records data from Olmsted County, Minnesota (2005-2012) to calculate BMI for 16,538 children.
• Employed a nonparametric hill-climbing algorithm to define homogenous BMI trajectory clusters.
• Analyzed BMI data with >3 weight assessments at least 1 year apart over an 8-year follow-up period.

Main Results:

• Children under 2 years who were overweight had a 3-fold increased risk of obesity (aHR=3.24).
• Children aged 5 years who were overweight faced a 10-fold increased risk of obesity (aHR=9.97).
• Three distinct BMI trajectories were identified before age 5, with obesity risk escalating with age.

Conclusions:

• Overweight status in early childhood, particularly before age 5, is a strong predictor of future obesity.
• Interventions targeting obesity prevention should be implemented before school age to redirect unhealthy BMI trajectories.
• Early identification and management of overweight children are critical for mitigating long-term obesity risks.