Obesity Alters Brain’s Response to Food Cues

Summary: New research using molecular imaging with 18F-flubatine PET/MRI shows a distinct response to food cues in the brains of obese individuals compared to those of normal-weight individuals.

The study sheds light on the biological mechanisms of obesity and opens the door to potential targeted treatments. Findings reveal a higher total distribution volume of 18F-flubatine in obese participants’ brains when viewing photos of food, suggesting neuroreceptors in the brain could be key targets for obesity treatments.

This work holds promise for the identification of biomarkers to facilitate personalized medicine approaches.

Key Facts:

  1. 18F-flubatine PET/MRI has revealed a different response to food cues in the brains of individuals with obesity compared to those of normal-weight individuals.
  2. This research demonstrates a higher total distribution volume of 18F-flubatine in the brains of obese participants when viewing photos of food.
  3. The findings could lead to the development of new drug treatments and behavioral interventions for obesity, and help in the identification of biomarkers for patient stratification.

Source: SNMMI

Molecular imaging with 18F-flubatine PET/MRI has shown that neuroreceptors in the brains of individuals with obesity respond differently to food cues than those in normal-weight individuals, making the neuroreceptors a prime target for obesity treatments and therapy.

This research, presented at the Society of Nuclear Medicine and Molecular Imaging 2023 Annual Meeting, contributes to the understanding of the fundamental mechanisms underlying obesity and offers valuable insights into potential medical interventions. 

Worldwide, more than one billion people are obese. The global obesity epidemic poses a major challenge for health care systems worldwide, and the search for interventions to achieve sustainable weight loss is a high priority.

This shows a brain made of spaghetti.
Worldwide, more than one billion people are obese. Credit: Neuroscience News

By investigating biological and behavioral mechanisms in individuals with obesity, scientists are seeking to identify potential pathways for treatments and interventions. 

“The brain’s cholinergic system is a unique area of interest when it comes to studying obesity,” said Swen Hesse, MD, clinical scientist and professor in the Department of Nuclear Medicine at the University of Leipzig in Leipzig, Germany.

“Cholinergic changes in the brain’s reward and attentional networks seem to play an important role in how people decide what foods are most desirable, or salient. In our study, we aimed to measure changes in α4β2* nicotinic acetylcholine receptors found in the cholinergic system in response to high-caloric food cues.” 

In the study, 15 individuals with obesity and 16 normal-weight controls underwent PET/MRI with 18F-flubatine twice on separate days, once while in a resting state and once while viewing food pictures.

Total distribution volume of 18F-flubatine was estimated, and a visual analog scale was used to assess states of hunger/satiety, appetite, disinhibition, craving and taste. Eating behavior was also measured using the Three-Factor Eating Questionnaire (TFEQ). 

In the resting state, no significant difference in total distribution volume of 18F-flubatine was noted between the participants with obesity and normal-weight controls. While viewing photos of food, however, the total distribution volume of 18F-flubatine was higher in the obese compared with normal-weight controls in the thalamus of the brain, particularly in those with a higher TFEQ score. 

For normal-weight controls there was a stronger connectivity to the dorsal attention network of the brain when viewing food cues, whereas for participants with obesity, a stronger connectivity was found with the salience network.

Finally, analyses of the total volume distribution and different behavioral measures showed significant correlation between total volume distribution in the hypothalamus and measure for satiety in normal-weight controls. In participants with obesity there was a significant correlation with measures of disinhibition and the nucleus accumbens. 

“We anticipate that the results of our study will pave the way for novel drug treatments and behavioral interventions to effectively combat obesity worldwide,” noted, Osama Sabri, MD, PhD, professor, director, and chairman of the Department of Nuclear Medicine at the University of Leipzig.

“In addition, the imaging technology utilized in this study holds promise for identifying biomarkers that can aid in patient stratification and facilitate personalized medicine approaches in the near future.” 

About this obesity and neuroimaging research news

Author: Rebecca Maxey
Source: SNMMI
Contact: Rebecca Maxey- SNMMI
Image: The image is credited to Neuroscience News

Original Research: The findings will be presented at the Society of Nuclear Medicine and Molecular Imaging Annual Meeting

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  1. Strikes me the brain changes may be MANIFESTATIONS of obesity. Rather than causing obesity, obesity may cause these brain changes. We have data documenting an association. I see none establishing causation.

  2. As a person with a terminal neurodegenerative disease, I look forward to reading the latest news in neuroscience.

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