A new study presented at the ENDO 2026 annual meeting of the Endocrine Society in the United States suggests that eliminating sugar completely may have unexpected effects on gut health and metabolism. The researchers emphasized that the work was done only in mice, has not yet been fully published in a peer reviewed journal, and cannot be directly applied to humans.
Scientists at the Dasman Diabetes Institute in Kuwait tested 12 mice for 16 weeks. Both groups ate a low fat diet, but one group also received sucrose while the other got no sugar at all. By the end of the study, the sugar free mice showed several changes the researchers considered concerning.
The clearest effect was a shift in the gut microbiome. Mice that avoided sugar entirely had fewer bacteria considered beneficial and more strains associated with inflammatory processes. The study also found signs of impaired blood sugar regulation and early insulin resistance, a condition in which cells respond less effectively to insulin and blood sugar rises, an early stage in type 2 diabetes. In addition, the sugar free mice developed early signs of fatty liver, even though their body weight was similar to the control group.
Lead researcher Dr. Rashid Ahmed said, “Our findings suggest that the complete removal of sucrose from a low fat diet may negatively affect the microbiome and metabolic health.” He said the study highlights the importance of dietary balance and moderate carbohydrate intake. An outside physician, Dr. Neuma Ofragi, said the findings challenge the simple idea that “the less sugar, the better,” while noting that nutrition is more complex than removing one ingredient. The article says the study does not change current advice to reduce added sugar, but it does argue against extreme elimination until larger human studies are done.
