AI Insight
This study examined 9-17 year-old youth with obesity and depression, finding that smaller hippocampal brain volumes predicted increased motivation to seek unhealthy foods over 24 months, but only in insulin-resistant participants. Insulin sensitivity appeared to moderate the relationship between brain structure and food-seeking behavior, with specific hippocampal subfields (CA2/3 and CA4) showing this effect exclusively in insulin-resistant youth. The findings suggest that insulin resistance creates a distinct neurometabolic risk profile that may drive unhealthy eating behaviors before type 2 diabetes develops.
Why it matters
These results identify a potential early intervention window for youth with obesity who show both insulin resistance and reduced hippocampal volume, as this combination appears to predict worsening unhealthy food-seeking behavior. Understanding this neurometabolic pathway could help clinicians identify high-risk youth and develop targeted interventions to prevent progression to type 2 diabetes and associated cognitive decline.
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⚠️ Preprint – Noch nicht peer-reviewed
Dieser Artikel wurde noch nicht von unabhängigen Experten begutachtet. Die Ergebnisse sind vorläufig und sollten mit Vorsicht interpretiert werden.
Insulin resistance, an often-untreated precursor of type 2 diabetes mellitus (T2DM), is implicated in cognitive decline in adults, yet its impact on the developing brain in youth with obesity remains poorly understood. We investigate whether insulin resistance moderates the relation between hippocampal volume and unhealthy food-seeking in overweight and depressed youth ages 9-17 who completed an oral glucose tolerance test and a cognitive task assessing unhealthy food-seeking motivation at baseline, 6-, and 24-months follow-up, and structural MRI at baseline and 6-months follow-up. Insulin sensitivity moderated this relation: smaller baseline hippocampal subfield volumes predicted increased unhealthy food-seeking over 24 months (ps<0.05). Categorical grouping revealed subfield CA2/3 and 4 volumes predicted this relation among insulin-resistant (ps<0.05), but not insulin-sensitive (ps>0.10), youth, suggesting that threshold criteria for insulin resistance are physiologically meaningful. These findings identify a neuro-metabolic risk phenotype that precedes T2DM and may accelerate unhealthy food-seeking severity in youth with obesity.