Clinical Scorecard: Caffeine may be tied to lower cortical surface area

At a Glance

Key Highlights

• In 9,632 adolescents, higher total caffeine intake was associated with lower total cortical surface area (standardized coefficient −0.03), but not average cortical thickness.
• Caffeinated soft drinks accounted for much of the surface-area association; coffee and espresso intake was associated with lower average cortical thickness, while tea intake was not significantly associated with cortical measurements.
• Shorter sleep duration partially mediated associations between total caffeine intake or soft drink intake and lower cortical surface area.
• Small sequential indirect associations between caffeine intake, sleep duration, cortical surface area, and mental health problems were observed at 6 and 18 months. At 18 months, the indirect association persisted for total surface area but not regional measurements.
• The observational design and self-reported caffeine intake prevent causal or directional conclusions.

Guideline-Based Recommendations

Diagnosis

• The study did not evaluate diagnostic criteria or recommend a diagnostic approach.

Management

• The authors state that screening for caffeine use may be relevant in adolescents with sleep disturbance or emerging mental health symptoms.

Monitoring & Follow-up

• The study does not specify a clinical monitoring protocol.

Risks

• Caffeine intake was observationally associated with lower cortical surface area; the study cannot establish that caffeine caused changes in brain structure.
• Residual confounding, including dietary patterns, health behaviors, stress, and adversity, may have influenced the findings. Beverage measures did not account for differences in caffeine or sugar content.

Patient & Prescribing Data

9,632 adolescents aged 9–11 years at baseline from 21 US sites; caffeine intake was self-reported and sleep duration was parent-reported.

No treatment or prescribing intervention was studied. The authors identify caffeine-use screening as potentially relevant for adolescents with sleep disturbance or emerging mental health symptoms.

Clinical Best Practices

• The authors suggest that screening for caffeine use may be relevant when adolescents have sleep disturbance or emerging mental health symptoms.
• Interpret the reported associations as observational rather than causal.
• When describing the findings, distinguish beverage types: soft drinks, coffee and espresso, and tea showed different associations with cortical measurements.

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