Sex Commonalities and Differences in Obesity-Related Alterations in Intrinsic Brain Activity and Connectivity

Area of Science:

• Neuroscience
• Obesity Research
• Sex Differences in Brain Function

Background:

• Obesity is a complex health issue with significant implications for brain function.
• Understanding sex-based differences in obesity's neurological impact is crucial for effective interventions.

Purpose of the Study:

• To investigate sex differences in the brain's reward network activity and connectivity in relation to body mass index (BMI).
• To characterize how intrinsic brain activity and functional connectivity vary between men and women with increasing BMI.

Main Methods:

• Functional magnetic resonance imaging (fMRI) scans were conducted on 86 adults (43 women, 43 men) at rest.
• Partial least squares analysis was used to examine sex differences in BMI-related brain activity (frequency power distribution) and reward network connectivity.

Main Results:

• Increased BMI correlated with altered activity in the globus pallidus (GP) and substantia nigra in both sexes.
• Women showed BMI-related increases in slow-4 activity in the right GP and putamen.
• Sex-specific connectivity patterns were observed, with women exhibiting reduced connectivity in reward networks and men showing increased connectivity with the medial frontal cortex.

Conclusions:

• The findings suggest that altered reward network connectivity in women with higher BMI may be linked to emotional eating.
• Personalized obesity treatments should consider individual sex-based differences in brain function.
• These results underscore the importance of sex as a biological variable in obesity research and treatment.