Modeling interactions between brain function, diet adherence behaviors, and weight loss success.

Area of Science:

• Neuroscience
• Obesity Research
• Behavioral Science

Background:

• Obesity is associated with altered brain activity in reward and control circuits.
• The specific brain activity linked to successful or unsuccessful weight loss remains unclear.

Purpose of the Study:

• To investigate the relationship between baseline brain activation patterns, adherence behaviors, and weight loss outcomes.
• To identify brain regions involved in responding to food cues and their predictive value for weight loss.

Main Methods:

• Functional magnetic resonance imaging (fMRI) was used to assess brain activation in response to food versus non-food cues in adults with obesity (N=75).
• Participants underwent a 3-month weight loss intervention including diet and physical activity.
• Structural equation modeling analyzed the links between baseline brain activation, intervention attendance, and weight loss.

Main Results:

• Activation in the left and right middle frontal gyri (L-MFG and R-MFG) was positively associated with viewing food cues.
• Significant pathways were identified: attendance predicted weight loss, R-MFG activation predicted attendance, and R-MFG indirectly influenced weight loss through attendance.

Conclusions:

• Baseline brain activation to appetitive food cues can predict future weight loss.
• This effect is mediated by intervention attendance, highlighting the role of self-regulation and food cue reactivity in weight management.