Navigation Links
Binge eaters' dopamine levels spike at sight, smell of food
Date:2/28/2011

UPTON, NY - A brain imaging study at the U.S. Department of Energy's (DOE) Brookhaven National Laboratory reveals a subtle difference between ordinary obese subjects and those who compulsively overeat, or binge: In binge eaters but not ordinary obese subjects, the mere sight or smell of favorite foods triggers a spike in dopamine - a brain chemical linked to reward and motivation. The findings - published online on February 24, 2011, in the journal Obesity - suggest that this dopamine spike may play a role in triggering compulsive overeating.

"These results identify dopamine neurotransmission, which primes the brain to seek reward, as being of relevance to the neurobiology of binge eating disorder," said study lead author Gene-Jack Wang, a physician at Brookhaven Lab and the Mount Sinai School of Medicine. Previous studies conducted by Wang's team have identified a similar dopamine spike in drug-addicted individuals when they were shown images of people taking drugs, as well as other neurochemical similarities between drug addiction and obesity, including a role for dopamine in triggering desire for drugs and/or food.

"In earlier studies of normal-weight healthy people who had been food-deprived for 16 hours, we found that dopamine releases were significantly correlated with self-reports of hunger and desire for food. These results provided evidence of a conditioned-cue response to food," Wang said.

In the current study, the researchers suspected that binge-eating obese subjects would show stronger conditioned responses to food stimuli when compared with non-binging obese subjects.

"Understanding the neurobiological mechanisms underlying food stimulation might point us toward new ways to help individuals regulate their abnormal eating behaviors," Wang said.

The scientists studied 10 obese people with a clinical diagnosis of binge eating disorder, based on evaluations at St. Luke's-Roosevelt Hospital, and 8 obese subjects who were not binge eaters.

The scientists used positron emission tomography (PET) to scan the subjects' brains after injecting a radiotracer designed to bind to dopamine receptors in the brain. Because the tracer competes with the brain's natural dopamine to bind to these receptors, the signal picked up by the PET scanner provides an inverse measure of the brain's dopamine levels: a strong signal from the bound tracer indicates low levels of natural brain dopamine; a low signal from the tracer indicates high levels of dopamine in the brain.

Each subject was scanned four times on two different days to test the effects of food stimulation vs. neutral stimulation with and without pre-administration of a drug known to amplify dopamine signals. The drug, methylphenidate, blocks the reuptake of dopamine from brain synapses, allowing it to linger longer. In scans without methylphenidate, subjects were given a placebo drug.

In the food stimulation condition, research subjects' favorite foods were heated (if appropriate) and waved in front of their mouths and noses so they could smell and even taste tiny amounts swabbed onto their tongues. For the neutral stimulation scans, researchers displayed non-food-related pictures and inanimate objects such as toys and clothing items in close proximity so research subjects could smell them while lying in the scanner. In all cases, research subjects had been fasting for 16 hours prior to scans.

Results

Food stimulation with methylphenidate significantly increased dopamine levels in the caudate and putamen regions of the brain in binge eaters but not in the non-binge eaters. Subjects with the most severe binge eating disorder, as assessed by psychological evaluations, had the highest dopamine levels in the caudate.

Dopamine levels did not rise significantly in other brain regions or under any other condition (neutral stimulation with or without methylphenidate, or food stimulation without methylphenidate) in either group, and were not correlated with body mass index of the research subjects. Assessments of the levels of receptors for dopamine also did not differ between the two groups.

"So the key difference we found between binge eaters and non-binge eating obese subjects was a fairly subtle elevation of dopamine levels in the caudate in the binge eaters in response to food stimulation," Wang said.

"This dopamine response is in a different part of the brain from what we've observed in studies of drug addiction, which found dopamine spikes in the brain's reward center in response to drug-associated cues. The caudate, in contrast, is believed to be involved in reinforcement of action potentially leading to reward, but not in processing of the reward per se. That means this response effectively primes the brain to seek the reward, which is also observed in drug-addicted subjects," Wang said.

Inasmuch as binge eating is not exclusively found in obese individuals, the scientists believe further studies are warranted to assess the neurobiological factors that may differentiate obese and non-obese binge eaters.


'/>"/>

Contact: Karen McNulty Walsh
kmcnulty@bnl.gov
631-344-8350
DOE/Brookhaven National Laboratory
Source:Eurekalert

Related medicine news :

1. Abstinence, heavy drinking, binge drinking associated with increased risk of cognitive impairment
2. Lowering the drinking age is unlikely to curb college binge drinking
3. Binge Drinking, Pot Could Put Teens Intellect at Risk: Study
4. 1 in 4 U.S. Teens and Young Adults Binge Drink: CDC
5. Binge Drinking, Hypertension a Deadly Combo
6. Are teen binge drinkers risking future osteoporosis?
7. Heavy alcohol use, binge drinking, might increase risk of pancreatic cancer, researcher reports
8. Short-Term Program for Binge Eaters Breaks New Ground
9. Short-term program for binge eaters has long-term benefits
10. Binge drinking doesnt affect next-day student test-taking
11. Mother of Binge Drinking Victim Urges Students and Parents to Discuss Signs of Alcohol Poisoning, Emphasize Peer Responsibility Prior to Spring Break
Post Your Comments:
*Name:
*Comment:
*Email:
(Date:2/11/2016)... ... February 11, 2016 , ... The president released a ... Health System but would shift more of the cost burden to military beneficiaries. ... laid out in the defense budget as including limited quantifiable benefit fixes mixed with ...
(Date:2/11/2016)... ... February 11, 2016 , ... In a new paper ... surgeon , Dr. Rod J. Rohrich, and colleagues, examine and underscore the importance ... for rhinoplasty surgeons when addressing this vital area. , The upper lateral cartilage ...
(Date:2/11/2016)... ... 11, 2016 , ... PharmMD CEO Robert Yeager ... focus on contract negotiations, corporate strategy and healthcare data law. Additional responsibilities will ... in data breaches for the Part D Star Rating improvement and Medication Therapy ...
(Date:2/11/2016)... ... February 11, 2016 , ... Talix ... Family Practice , will be presenting at the 2016 HIMSS Annual Conference & ... , During his session, “ Coding for Care: Using Data Analytics for ...
(Date:2/11/2016)... ... 2016 , ... Be Well Medical Group (Be Well) is pleased ... at 108 South Columbus St, Suite 201, Alexandria, VA. Be Well Medical Group is ... the convenience of their homes, offices or at the practices’ local office. It is ...
Breaking Medicine News(10 mins):
(Date:2/11/2016)... has taken Kickstarter by storm, crowdfunding over $60,000 – or 120% of its original funding goal. With ... to backers starting May of this year. Photo - ... ... ... Created by NAMU, a team of biomedical engineers out of South Korea ...
(Date:2/11/2016)... 11, 2016 Transformational M&A achieved through ...   --> Transformational M&A achieved through NPS and ... --> Transformational M&A achieved through NPS and Dyax ... Positioned for future growth with most robust pipeline in Shire ... for future growth with most robust pipeline in Shire ...
(Date:2/11/2016)... Feb. 11, 2016 Brain Cancer patients ... method at West Cancer Center . Optune™, ... to inhibit cancer cell replication causing death of cancer ... a decade to show a significant extension in overall ... patients. Currently, West Cancer Center is the only medical ...
Breaking Medicine Technology: