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New research suggests that when people with alcohol use disorder stop drinking, their brains show a sudden, sharp drop in the ability to burn a secondary fuel source called acetate, before recovering just a few weeks later. The study, published in Neuropsychopharmacology, provides evidence that the brain’s metabolic adaptation to heavy alcohol consumption is highly reversible.
Alcohol use disorder is a medical condition characterized by an inability to stop or control alcohol use despite adverse social, occupational, or health consequences. Chronic drinking alters the balance of chemical messengers in the brain, contributing to the intense physical and emotional symptoms that occur when a person tries to quit. However, alcohol also changes how the brain fuels itself.
The human brain usually runs on glucose, a simple sugar. But when a person drinks, the liver breaks down the alcohol into a chemical called acetate, which floods the bloodstream. A 2012 study showed that drinking alcohol leads the brain to rely less on glucose and instead take up this circulating acetate for energy. Specialized brain cells called astrocytes eagerly absorb the acetate, using it to power their operations and support nearby neurons.
“There are examples of the brain changing fuel sources, changing to one and changing away from another,” Graeme F. Mason, a professor of radiology and biomedical imaging and psychiatry at the Yale Biomedical Imaging Institute at the Yale School of Medicine, told PsyPost. “One example is in starvation, when the brain reduces its reliance on sugar and increases its capacity to consume ketone bodies. Another is that in diabetes with hypoglycemia unawareness, the brain increases its capacity to consume things other than sugar.”
“Newer data also look like people with chronically high blood sugar are down-regulating their ability to transport glucose into the brain, which may be protecting the brain against having high sugar inside,” Mason continued. “Well, long ago, T.K. Li, the former director of the National Institute on Alcohol Abuse and Alcoholism, was talking with me about metabolism and highlighted that when people drink alcohol, it raises blood concentration of acetate.”
Because heavy drinkers are constantly exposed to this alternative fuel, their bodies adjust to the surplus. Previous research published in 2013 indicated that the brains of heavy drinkers develop an increased capacity to burn acetate compared to the brains of light drinkers. The brain essentially gets used to running on the breakdown products of alcohol.
“If somebody binges on the weekends, they have intermittently high blood acetate levels,” Mason explained. “And if somebody reaches a state at which they have difficulty not drinking, where they may want treatment, then their blood acetate levels are elevated almost constantly, even when they’re asleep. We have been wondering if there’s something in there that we might be able to use to help people stop drinking.”
Given these adaptations, scientists are exploring how this energy shift relates to the severe symptoms people experience during detoxification. When alcohol is removed, the sudden loss of acetate might shock the brain’s energy systems. Providing alternative brain fuels during detoxification might ease this transition. For instance, a 2021 clinical trial found that giving patients in alcohol detox a high-fat, low-carbohydrate diet reduced withdrawal severity. This aligns with a study covered by PsyPost in 2026 noting that ketone supplements lowered alcohol cravings by providing the brain with a substitute energy source.
Building on this line of research, a team led by Chathura Kumaragamage of the University of Calgary and Mason investigated what happens to acetate metabolism in the brains of people with alcohol use disorder as they undergo detoxification and maintain sobriety. They wanted to see if the brain’s heightened ability to burn acetate would persist or normalize after drinking stopped.
“We found about 15 years ago that people who drink at risky levels are much more able to use the acetate in their blood, but that was a smallish study,” Mason said. “We really needed to test this finding to see if it was real, to see if we could reproduce it, or if it was just a fluke. The National Institute on Alcohol Abuse and Alcoholism (NIAAA) gave us funds to test it in a new, larger group of people, and to extend the test to people who were seeking treatment.”
The researchers recruited four groups of participants. The sample included 13 light drinkers who consumed fewer than three standard drinks a week, and 15 heavy drinkers who drank at risky levels over the past six months. They also recruited six individuals in long-term recovery who had been abstinent for at least six months. Finally, they included a group of treatment-seeking individuals with alcohol use disorder who were undergoing medically supervised inpatient detoxification.
Of the treatment-seeking group, nine provided usable data at roughly one week of abstinence, and ten provided data at roughly one month of abstinence. Seven of these participants successfully completed scans at both time points, allowing the researchers to track their progress directly.
During the testing session, participants received an intravenous infusion of a specialized form of acetate containing a stable carbon isotope. This harmless carbon-13 isotope acts as a tracking tag. By taking frequent blood samples, the researchers could monitor how much acetate was in the bloodstream and how quickly the body was clearing it.
To see what was happening inside the head, the team used magnetic resonance spectroscopy, a non-invasive imaging technique that measures chemical signatures in the body. They focused the scanner on the occipital cortex at the back of the brain. They measured how quickly the tagged acetate was taken up by astrocytes and converted into neurotransmitters like glutamate and glutamine.
The researchers also calculated a metric called energy per cycle. This ratio compares the brain’s basic cellular energy consumption to the rate of chemical signaling between neurons. It provides a snapshot of whether the brain’s energy supply is keeping up with its communication demands.
Going into the study, the research team expected the newly abstinent group to show a massive capacity for acetate consumption, given their history of heavy alcohol use. Instead, the results went in the opposite direction. After one week of abstinence, the detoxification group showed a 64 percent lower rate of brain acetate oxidation compared to the heavy drinkers, and a 41 percent lower rate compared to those in long-term recovery.
“This latter group consumed way more alcohol than the risky drinkers, and so we assumed that the people seeking treatment would also use way more acetate,” Mason said. “To our surprise, we found that the people looking for treatment had a far lower capacity to consume acetate.”
“We think that this may happen because, just like with chronically elevated glucose leading to less capacity to transport glucose into the brain, the chronically elevated acetate may lead the brain to lower its transport capacity and protect itself,” Mason explained. “Acetate can do things like interact with the genome to change how DNA gets expressed, so there’s one reason that the brain might not want so much acetate around all the time.”
The blood tests confirmed this metabolic slowdown was happening across the whole body. The newly abstinent group had higher levels of acetate remaining in their blood during the infusion, indicating that their systems were clearing acetate unusually slowly.
The heavy drinking group, meanwhile, showed a 58 percent higher rate of brain acetate oxidation than the light drinking group. This confirmed the team’s 2013 findings, demonstrating that active heavy drinking increases the brain’s reliance on acetate.
“Maybe it is the intermittent acetate exposure of risky drinking can increase acetate consumption capacity, while chronic heavy acetate of dependence reduces the capacity to protect the brain,” Mason noted. “It is likely that the people who drink to the point of dependence have nearly constant elevations of acetate, and the brain resets so that it lets in a little bit, so that the brain, sitting behind its protective barrier, sees some acetate, but not as much as if it had not protected itself.”
The metabolic slump seen during early abstinence was strictly temporary. When the researchers tested the detoxification group again after one month of abstinence, their brain acetate consumption had increased by 43 percent. At this one-month mark, their acetate metabolism was nearly indistinguishable from that of the light drinkers, suggesting the brain rapidly readapts to functioning without alcohol.
“The good news is that after a month, this aspect of alcohol dependence has gone back close to normal,” Mason said. “There are other changes in the brain that can also normalize, given more time, like the volume loss (the brain shrinks with that heavy drinking and can return at least partway to normal).”
Despite the dramatic shifts in how quickly the brain burned acetate, the energy per cycle measurement was similar across all groups. This indicates that the fundamental balance between energy consumption and neurotransmitter cycling remained stable. Even as the type of fuel being burned shifted, the basic energetic health of the neuronal networks appeared intact.
As with all research, there are some caveats to consider. Sample sizes were small, particularly for the long-term recovery and one-week abstinence groups. This limited the researchers’ statistical power, making it difficult to assess how other variables, such as sex differences or tobacco use, might influence brain metabolism.
The categories of light and heavy drinking were based on self-reported histories, which can sometimes be imprecise compared to objective medical markers. Additionally, the acetate was administered directly into a vein during the scan. This differs from real-world drinking, where acetate is produced gradually by the liver.
Mason also warned against drawing incorrect conclusions about drinking alcohol for a quick energy boost. “I have encountered two misinterpretations: just because acetate can be consumed for energy does not mean that alcohol is helpful when you are tired,” he said. “The process of getting from alcohol to acetate creates oxygen free radicals, hydrogen peroxide, and acetaldehyde, which is a powerful carcinogen and toxin. So, don’t drink alcohol in search of energy.”
Similarly, he cautioned against using household vinegar as a home remedy for withdrawal. “The second misinterpretation is that people should drink vinegar to help them stay sober,” Mason added. “To get the amount of acetate your body provides from a couple of margaritas, you would need to drink about a quart of grocery store vinegar. That will damage the enamel on your teeth and is a huge acid load that is hard on the throat and stomach.”
The authors suggest that the depressed acetate metabolism during early withdrawal might be a protective mechanism that limits the brain’s exposure to high acetate levels, or it could simply reflect temporary cellular sluggishness as the brain adjusts to the sudden absence of alcohol. Exploring how other alternative energy sources might smooth this transition could lead to new dietary or medical therapies for alcohol withdrawal.
“One practical outcome is another piece of evidence that alcohol dependence as a physical condition, one that can benefit from medical interventions,” Mason said. “I know that it’s difficult to stop, but the benefits are great, and there are FDA-approved medications proven to help people stop or reduce their drinking. The NIAAA web site has something called the Treatment Navigator to help people find resources.”
The study, “Reversible alterations of brain acetate metabolism associated with alcohol consumption,” was authored by Chathura Kumaragamage, Lihong Jiang, Gustavo A. Angarita, Robin A. de Graaf, Elizabeth Guidone, Anastasia Coppoli, Kevin L. Behar, Barbara I. Gulanski, Brian Pittman, Stuart A. Weinzimer, Douglas L. Rothman, John H. Krystal, and Graeme F. Mason.