A new study suggests that the common tendency to regain weight after dieting may be rooted in the brain rather than a lack of willpower. Researchers found that weight loss triggers changes in brain circuits involved in hunger, reward, and food motivation, making people more likely to eat and regain lost weight.

The findings, according to an article published by The Conversation, indicate that the brain responds to calorie restriction by increasing the drive to seek food while reducing the body's energy expenditure, creating biological pressure to restore lost weight. These adaptive mechanisms may explain why long-term weight maintenance remains challenging for many people.

The researchers say a better understanding of these brain-driven processes could help develop more effective obesity treatments that target the biological factors behind weight regain, alongside diet and lifestyle interventions.