A decade-long study of more than 123,000 people in the United Kingdom has surfaced a disquieting paradox: the drinks marketed as the healthier alternative to sugary sodas may carry an even greater risk to the liver. Presented at a European gastroenterology conference, the findings invite a broader reckoning with how modern food culture has long equated 'diet' with 'safe,' even as the liver — quietly and often invisibly — bears the cost. The research is preliminary and awaits peer review, but it arrives at a moment when metabolic liver disease already touches roughly one in three people worldwi
Diet drinks pose greater liver disease risk than sugary alternatives, study finds
Diet drinks may harm your liver more than sugar ever could
Mark
So the headline is that diet drinks are worse than regular sugary drinks for your liver. Is that actually what the data shows?
Mimi
The study found a higher risk increase with diet drinks—60 percent versus 50 percent—but it's important to say this is correlation, not causation. Both types of drink were associated with increased risk.
Luke
Right, and the study hasn't been peer-reviewed yet. We're looking at preliminary findings presented at a conference. That's not nothing, but it's also not the same as a published, vetted study.
Mark
What's the actual mechanism? Why would a drink with no sugar be worse?
Mimi
The theory is that artificial sweeteners alter your gut bacteria, mess with your sense of fullness, and may actually trigger insulin release even without sugar. Sugar does different damage—blood glucose spikes, weight gain, higher uric acid.
Luke
Both pathways lead to fat in the liver, but we don't fully understand the artificial sweetener pathway yet. That's something Liu herself says needs more research.
Mark
How many people are we talking about with this liver disease?
Mimi
Over 30 percent of people worldwide have it. In the UK, it could be one in five, maybe higher. But 80 percent of people with it don't even know they have it.
Luke
The study looked at 123,788 people over ten years, which is substantial. But the UK Biobank skews toward white participants who are healthier than average, so the findings may not apply equally to everyone.
Mark
What should someone actually do with this information?
Mimi
The researchers say replace both sugary and diet drinks with water. That's the clearest takeaway.
Luke
That's solid advice regardless. But people should know this is early-stage research pointing in a direction, not a final answer.
Le Pouls
- A study tracking over 123,000 UK adults for ten years found that daily diet drink consumption raised the risk of metabolic liver disease by 60% — higher than the 50% risk tied to sugary drinks.
- The finding strikes at a cornerstone of public health messaging, exposing the 'diet is safer' assumption as potentially more harmful than the habit it was meant to correct.
- Two distinct biological pathways are at work: sugar floods the bloodstream with glucose and drives fat to the liver, while artificial sweeteners quietly rewire gut bacteria and override the body's hunger signals.
- The disease at the center of this story — fat accumulation in the liver — affects more than 30% of people globally, yet roughly 80% of those with it have never been diagnosed.
- Researchers are urging people to replace both drink types with water, even as they acknowledge the study has not yet been peer-reviewed and cannot prove direct causation.
- Next steps include a full peer-reviewed publication, longer studies across more diverse populations, and closer examination of whether individual sweeteners carry different levels of risk.
A decade-long study of more than 123,000 people in the United Kingdom has surfaced a disquieting paradox: the drinks marketed as the healthier alternative to sugary sodas may carry an even greater risk to the liver. Presented at a European gastroenterology conference, the findings invite a broader reckoning with how modern food culture has long equated 'diet' with 'safe,' even as the liver — quietly and often invisibly — bears the cost. The research is preliminary and awaits peer review, but it arrives at a moment when metabolic liver disease already touches roughly one in three people worldwide, most of them unaware.
A study presented at a major European gastroenterology conference has challenged one of the most persistent assumptions in modern nutrition: that diet drinks are a safer alternative to sugary ones. Tracking more than 123,000 participants in the UK Biobank over ten years, researchers found that daily consumption of artificially sweetened beverages was associated with a 60 percent increased risk of metabolic dysfunction-associated steatotic liver disease — compared to a 50 percent increased risk from sugar-sweetened drinks.
MASLD, as the condition is known, involves the accumulation of fat in the liver and now affects more than 30 percent of people globally. In the UK alone, the British Liver Trust estimates it may affect as many as one in five people, with some experts placing the true figure even higher. The condition is particularly insidious: around 80 percent of those who have it remain undiagnosed, as symptoms are often absent or easily confused with other ailments.
The research, led by graduate student Lihe Liu of Soochow University's First Affiliated Hospital, found that the two drink types harm the liver through different mechanisms. Sugary drinks spike blood glucose and insulin, promote weight gain, and raise uric acid levels. Artificially sweetened drinks, despite containing no sugar, appear to disrupt gut microbiota, interfere with satiety signals, intensify sweet cravings, and may even provoke insulin secretion. Liu's recommendation was straightforward: limit both and replace them with water.
Important caveats remain. The study has not yet been peer-reviewed or published in a scientific journal, and as an observational study it can demonstrate correlation but not causation. The UK Biobank's participants are also predominantly white and healthier than the broader population, which may limit how widely the findings apply. Liu outlined a clear path forward — completing peer review, conducting longer and more diverse studies, and untangling whether specific artificial sweeteners pose greater risks than others.
A study presented at a major European gastroenterology conference has upended a widely held assumption: diet drinks may be worse for your liver than the sugary versions they were designed to replace. Researchers tracking over 123,000 people in the UK Biobank over a decade found that those consuming artificially sweetened beverages daily faced a 60 percent increased risk of metabolic dysfunction-associated steatotic liver disease, compared to a 50 percent increased risk from sugar-sweetened drinks.
Metabolic dysfunction-associated steatotic liver disease, or MASLD, is a condition in which fat accumulates in the liver. It now affects more than 30 percent of people globally, and the British Liver Trust estimates it may touch as many as one in five people in the UK—though some experts believe the true prevalence could reach 40 percent. The disease often goes undetected; roughly 80 percent of those with MASLD remain undiagnosed because symptoms are either absent or easily mistaken for other ailments.
The research, led by Lihe Liu, a graduate student at the First Affiliated Hospital of Soochow University, challenges the common marketing narrative that diet drinks represent a healthier choice. The mechanisms differ between the two types. Sugar-sweetened beverages trigger rapid spikes in blood glucose and insulin levels, promote weight gain, and elevate uric acid—all pathways that drive fat accumulation in the liver. Artificially sweetened drinks work through a different route: they alter the composition of gut bacteria, disrupt the body's satiety signals, intensify cravings for sweet foods, and may even stimulate insulin secretion despite containing no sugar.
Liu emphasized that the findings warrant a reconsideration of how these beverages fit into everyday diets, particularly as MASLD emerges as a pressing global health concern. She noted that the safest approach is to limit both types of sweetened drink and replace them with water. However, important caveats surround this research. The full study has not yet undergone peer review or been published in a scientific journal, meaning the scientific community has not yet had the opportunity to scrutinize its methods and limitations. The study also cannot establish causation—it shows correlation between consumption and disease risk, not that the drinks directly cause liver problems.
Additionally, the UK Biobank itself carries limitations. Its participants are predominantly white and tend to be healthier than the general UK population, which may skew the findings. Liu acknowledged these gaps and outlined the next steps: completing the full manuscript for peer review, conducting longer-term studies in more diverse populations, and investigating whether different artificial sweeteners carry different levels of risk. The biological mechanisms linking artificially sweetened beverages to liver disease remain incompletely understood, and clarifying them will require further research.
Citations marquantes
These findings challenge the common perception that these drinks are harmless and highlight the need to reconsider their role in diet and liver health.— Lihe Liu, lead study author
The safest approach is to limit both sugar-sweetened and artificially sweetened drinks.— Lihe Liu
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