Research shows that two rare sugars called D-allulose and D-tagatose may reduce cravings for regular sugar and alcohol by triggering a natural brain hormone called FGF21. According to Gram Research analysis, in animal studies these rare sugars increased FGF21 levels enough to suppress appetite for sugary and alcoholic foods without affecting how they taste. While these findings are promising, human clinical trials are still needed to confirm whether these rare sugars work the same way in people.
Scientists have discovered that two rare sugars called D-allulose and D-tagatose might help people eat less junk food and drink less alcohol. According to Gram Research analysis, these sugars trigger a natural brain chemical that reduces cravings without making food taste worse. In animal studies, these rare sugars prevented weight gain and alcohol dependence by activating the body’s own appetite-control system. If these findings hold up in human studies, these sugars could become a new tool for fighting obesity and alcoholism—two major health problems affecting millions worldwide.
Key Statistics
A 2026 research article found that D-allulose and D-tagatose, two rare sugars, increased plasma FGF21 levels in mice to amounts sufficient to reduce preference for simple sugars and alcohol without changing food palatability.
Laboratory studies showed that rare sugars D-allulose and D-tagatose prevented the development of diet-induced obesity and alcohol dependence in mice through activation of the FGF21-oxytocin feedback system.
Research demonstrates that D-allulose and D-tagatose are generally recognized as safe rare sugars that activate ATF4-dependent FGF21 induction, a natural appetite-suppression pathway in the brain.
The Quick Take
- What they studied: Whether two rare sugars (D-allulose and D-tagatose) can reduce cravings for regular sugar and alcohol by triggering natural brain chemicals that control appetite.
- Who participated: Laboratory mice were used in this research to test how the rare sugars affect eating and drinking behaviors. Human studies have not yet been conducted.
- Key finding: Both rare sugars increased a hormone called FGF21 in the bloodstream, which activated brain cells that suppress appetite for sugar and alcohol without changing how food tastes.
- What it means for you: These rare sugars might eventually help people struggling with overeating or alcohol use, but this research is still in early stages. More human studies are needed before these sugars become a medical treatment.
The Research Details
This research article examined how two rare sugars work in the body to reduce cravings. The scientists studied D-allulose and D-tagatose, which are sugars that are safe to eat but work differently than regular sugar. They tested these sugars in mice to see if they could trigger the release of a hormone called FGF21. When FGF21 is released, it activates special brain cells in an area called the hypothalamus that control hunger and cravings. The researchers measured how much the mice ate, how much they drank, and whether they gained weight over time.
Understanding how the body naturally controls cravings is important because obesity and alcoholism are serious health problems worldwide. If scientists can find safe foods that trigger the brain’s natural appetite-control system, it could help millions of people without requiring medications or surgery. This research shows that the body has built-in mechanisms to stop us from overeating or overdrinking—we just need to find ways to activate them.
This is a research article published in the Journal of Biochemistry in 2026. The study was conducted in laboratory animals (mice), which means the results may not directly apply to humans yet. The researchers used established scientific methods to measure hormone levels and track eating and drinking behaviors. However, human clinical trials are needed to confirm whether these rare sugars work the same way in people.
What the Results Show
When mice consumed D-allulose or D-tagatose, their blood levels of FGF21 increased significantly. This increase in FGF21 activated brain cells in the hypothalamus that control appetite, specifically through a system involving oxytocin (a hormone that affects behavior and emotions). The activated brain cells then sent signals that reduced the mice’s preference for regular sugar and alcohol. Importantly, the rare sugars did this without making food taste bad or unpleasant—the mice simply wanted less of the sugary or alcoholic foods. Over time, mice that consumed these rare sugars ate less, drank less alcohol, and gained less weight compared to control mice.
The research identified the specific biological pathway responsible for these effects. The rare sugars activate a protein called ATF4, which then triggers FGF21 production. This creates a natural feedback loop: when you eat something sweet or alcoholic, your body produces FGF21, which then reduces your desire for more of those substances. This is the body’s natural way of preventing overconsumption. The researchers also found that D-allulose and D-tagatose are generally recognized as safe by food safety authorities, meaning they have no known harmful effects at normal consumption levels.
Previous research has shown that FGF21 plays a role in controlling appetite and metabolism, but this is the first study to demonstrate that rare sugars can reliably trigger FGF21 production. Earlier work suggested that the body produces FGF21 naturally in response to sugar and alcohol, but scientists didn’t know how to harness this response. This research builds on that foundation by identifying specific rare sugars that can activate this natural system without the negative effects of regular sugar.
This study was conducted entirely in mice, not humans. Animal studies don’t always produce the same results in people due to differences in metabolism and brain chemistry. The research doesn’t specify how much of these rare sugars would be needed in humans or how long the effects would last. Additionally, the study doesn’t address whether people would actually consume these rare sugars regularly or whether they would become accustomed to them over time. Long-term human studies are needed to determine safety and effectiveness in real-world conditions.
The Bottom Line
Based on this research, D-allulose and D-tagatose show promise as potential tools for reducing cravings for sugar and alcohol. However, these are not yet proven treatments. People interested in these rare sugars should wait for human clinical trials before expecting significant health benefits. If you struggle with overeating or alcohol use, consult with a healthcare provider about evidence-based treatments that are currently available.
This research is most relevant to people who struggle with sugar cravings, overeating, or alcohol dependence. It may also interest food scientists and public health officials looking for new approaches to obesity and alcoholism prevention. People with diabetes or those following specific diets should consult their doctor before consuming rare sugars. This research is not yet applicable to general consumers, as human studies have not been completed.
If these rare sugars eventually become available as functional foods or supplements, benefits would likely appear within days to weeks of regular consumption, based on how quickly FGF21 levels change. However, significant weight loss or behavior change would probably take several weeks to months. The timeline for human clinical trials and potential product approval could be several years away.
Frequently Asked Questions
Can rare sugars like D-allulose help me lose weight?
Animal studies show D-allulose and D-tagatose may reduce cravings for sugary foods by triggering FGF21, a natural appetite-control hormone. However, human clinical trials haven’t been completed yet, so effectiveness in people remains unproven.
Are D-allulose and D-tagatose safe to eat?
Both rare sugars are generally recognized as safe by food authorities with no known harmful effects at normal consumption levels. However, long-term human safety studies are still needed to confirm their safety for regular use.
How do rare sugars reduce alcohol cravings?
Rare sugars trigger FGF21 release, which activates brain cells in the hypothalamus that naturally suppress appetite for alcohol. This creates a biological feedback loop that reduces the desire to drink without making alcohol taste bad.
When will these rare sugars be available as a treatment?
This research is still in early stages using animal models. Human clinical trials would need to be conducted and approved before these rare sugars could become available as medical treatments or functional foods, likely several years away.
Do rare sugars work differently than regular sugar?
Yes. Regular sugar increases FGF21 naturally, but rare sugars like D-allulose and D-tagatose trigger much stronger FGF21 responses that suppress appetite for sweet and alcoholic foods, whereas regular sugar does the opposite.
Want to Apply This Research?
- Track daily cravings for sugary foods and alcohol on a scale of 1-10, along with any rare sugar consumption, to identify patterns and measure changes over time.
- If rare sugar products become available, users could log their consumption and monitor changes in appetite, food choices, and overall eating patterns through the app’s food diary feature.
- Create a weekly summary dashboard showing craving intensity, food choices, and consumption patterns to help users identify whether rare sugars are affecting their eating behaviors over time.
This research is based on animal studies and has not been tested in humans. These rare sugars are not currently approved as medical treatments for obesity or alcoholism. Anyone considering using D-allulose, D-tagatose, or other rare sugars should consult with a healthcare provider first, especially those with diabetes, metabolic disorders, or those taking medications. This article is for educational purposes only and should not replace professional medical advice. Do not use this information to self-treat obesity or alcohol dependence; seek guidance from qualified healthcare professionals.
This research translation is published by Gram Research, the science division of Gram, an AI-powered nutrition tracking app.