Childhood obesity among the poor in Peru: Are there implications for cognitive outcomes?

Area of Science:

• Developmental Psychology
• Public Health
• Econometrics

Background:

• Limited research exists on the relationship between child cognition and weight status, particularly in developing countries.
• Socioeconomic factors may influence the interplay between child weight and cognitive development.
• Understanding these relationships is crucial for targeted interventions among impoverished populations.

Purpose of the Study:

• To investigate the association between child weight status (from thin to obese) and cognitive abilities in impoverished Peruvian children.
• To examine how this relationship varies by gender, urban/rural setting, and indigenous status at ages five and eight.
• To address potential biases from unobservable heterogeneity in the analysis.

Main Methods:

• Utilized three rounds of panel data from the Peruvian Young Lives study.
• Measured child weight status using Body Mass Index (BMI) z-scores.
• Assessed cognitive function via the Spanish version of the Picture Peabody Vocabulary Test (PPVT).
• Employed statistical methods to correct for unobservable heterogeneity.

Main Results:

• Initial analysis suggested obese children had higher cognitive scores, particularly females, non-indigenous, and urban children.
• After correcting for unobservable heterogeneity, this link between obesity and cognition largely disappeared, with a weak, weakening association for obese females.
• Severely thin or thin indigenous children consistently showed significantly lower cognitive scores, a relationship that strengthened between ages five and eight.

Conclusions:

• The initial observed link between childhood obesity and higher cognition in this population appears to be driven by unobserved factors.
• Thinness, especially among indigenous children, is robustly associated with lower cognitive scores, highlighting a critical developmental concern.
• This study underscores the importance of controlling for unobserved heterogeneity and provides novel insights into child cognition and weight status in a developing country context.