Scientists in Japan have identified a biological pathway that links the body’s regulation of sugar appetite with its control of alcohol consumption — a discovery that could pave the way for dietary approaches to treating alcohol dependence.
Researchers at Kyoto University were investigating the FGF21-oxytocin-dopamine system, a hormonal and neural mechanism known to govern how the body manages cravings for sugar, when they noticed existing evidence suggesting the protein FGF21 may also have a role in how much alcohol a person drinks. Given that alcohol is a product of sugar fermentation, the team hypothesised that the body may treat the two substances as biologically related.
To test the idea, they developed a new experimental model of alcohol dependence in mice and used it to assess how food ingredients known to stimulate FGF21 affected drinking behaviour. They found that in healthy mice, the FGF21-oxytocin-dopamine system acts as a natural brake on alcohol consumption — a kind of satiety signal. In alcohol-dependent mice, the system was suppressed, which the researchers believe contributes to excessive drinking. When the pathway was reactivated using rare sugars — a class of naturally occurring but uncommon carbohydrates — alcohol intake fell considerably in both groups.
The findings suggest that dependence on alcohol may not be purely a matter of conscious behaviour or substance misuse, but may partly reflect disruption to subconscious metabolic signalling in the brain. Correcting that signal through dietary means could, the team argues, offer a more tolerable alternative to existing drug treatments, which often work by blocking the pleasure of drinking and therefore see poor uptake among patients.
“Our work demonstrates that there is a subconscious inter-organ crosstalk signal that regulates appetite for alcohol,” said team leader Professor Tsutomu Sasaki. “Dietary therapy is effective in controlling appetite if you can stick to it, but most can’t. The same applies to over-drinking.”
Corresponding author Dr Sho Matsui added that the goal was to find an intervention that could serve as a genuine substitute for alcohol rather than simply eliminating its appeal. “We imagined that some functional sugars may be able to fill that role,” he said.
The researchers caution that the work remains at the preclinical stage and that further studies are needed to establish whether the same mechanisms operate in humans. Their next steps include exploring practical applications such as dietary supplements, functional drinks and nutraceuticals designed to activate FGF21, alongside the potential development of a pharmaceutical compound targeting the same pathway.