Relationship between BMI and alcohol consumption levels in decision making

Area of Science:

• Neuroscience
• Psychiatry
• Behavioral Science

Background:

• Decision-making deficits are implicated in obesity and alcohol use disorder (AUD).
• These deficits may lead to choosing immediate rewards over long-term well-being.

Purpose of the Study:

• Investigate neural activation differences in decision-making between individuals with and without obesity and varying risks of AUD.
• Examine the independent and interactive effects of Body Mass Index (BMI) and AUD risk on brain function during a gambling task.

Main Methods:

• Utilized functional MRI (fMRI) data from the Human Connectome Project (HCP) dataset.
• Analyzed gambling task performance in 418 participants categorized by BMI (obesity vs. lean) and AUD risk (high vs. low).
• Examined neural activation in response to reward and punishment cues.

Main Results:

• Observed interactions between BMI and alcohol drinking risk in the default mode network (DMN), self-related processing, memory, and salience attribution regions.
• Individuals with obesity and high AUD risk (obesityHR) showed increased DMN activation and recruitment of regions associated with inattention and uncertain choices, potentially driving impulsive behavior.
• Heightened DMN activation was also observed in obesityHR compared to lean individuals, suggesting distinct neural correlates for obesity and AUD risk.

Conclusions:

• BMI and alcohol drinking levels appear to independently influence neural processing during decision-making tasks.
• Findings suggest distinct negative effects of obesity and chronic alcohol consumption on decision-making processes.
• Neural differences highlight independent associations of obesity and high-risk alcohol drinking with key decision-making components.