While reducing sugar intake is often considered a healthy choice, a new study suggests that completely eliminating sugar from the diet may not always be beneficial and could, in some cases, have unintended consequences for metabolic health.
The findings were presented at the Endo 2026 medical conference in Chicago, where researchers shared results from an animal study examining the effects of removing sucrose — commonly known as table sugar — from the diet.
Researchers conducted a 16-week study on mice, dividing them into two groups.
One group was fed a low-fat diet that included sucrose, while the second group received a similar low-fat diet but without any sugar.
Although both groups maintained nearly the same body weight throughout the study, scientists observed several unexpected health issues among the mice that completely avoided sugar.
Metabolic health problems emerged
According to the researchers, mice deprived of sugar showed a reduced ability to regulate blood sugar levels and experienced increased insulin resistance.
The study also found signs of metabolic dysfunction, suggesting that completely removing sugar from the diet may affect the body's ability to process and manage energy efficiently.
Scientists reported that the balance of beneficial gut bacteria deteriorated in the sugar-free group.
These changes were accompanied by increased intestinal inflammation, highlighting a potential link between sugar restriction and gut health.
The researchers noted that gut bacteria play a significant role in regulating metabolism and controlling inflammation throughout the body.
Liver changes also detected
In addition to metabolic and digestive concerns, the study identified changes in the liver of mice that avoided sugar entirely.
Researchers said these alterations are considered to be associated with fatty liver disease, raising further questions about the long-term effects of completely eliminating certain dietary components.
The lead researcher said the findings highlight the importance of maintaining balance in a healthy diet.
According to the research team, completely removing a single dietary component is not necessarily beneficial and may produce unexpected effects on the body's metabolic systems.
The researcher explained that eliminating sucrose entirely could influence the composition of beneficial gut bacteria, which are essential for maintaining overall metabolic health.
Human research still needed
Experts cautioned that the study was conducted on animals, meaning the findings cannot yet be directly applied to humans.
They stressed that further human studies will be necessary to determine whether similar effects occur in people who completely avoid sugar.The researchers suggested that future dietary recommendations should focus on overall nutritional balance, healthy carbohydrate intake, and gut health rather than solely on eliminating sugar.
According to experts, excessive sugar consumption remains harmful, but complete avoidance may not be the most effective strategy in every situation. Instead, moderation and a balanced diet may offer better long-term health outcomes.
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