In news that will delight anyone who has ever eyed a donut with longing, scientists have found that giving up sugar entirely may not be the unqualified win health gurus have led us to believe. New research presented Saturday at ENDO 2026, the Endocrine Society's annual meeting in Chicago, suggests that completely removing sugar from the diet could have some decidedly unintended consequences for gut and metabolic health.
Researchers from the Dasman Diabetes Institute in Kuwait fed mice a low-fat diet containing no sucrose (that's table sugar to the rest of us) and compared them over 16 weeks with a control group that got the same low-fat diet but with sucrose included. "Completely removing sucrose from a low-fat diet may unexpectedly disrupt gut health and promote inflammation and metabolic dysfunction, highlighting that balanced nutrition is more important than simply eliminating sugar," said Rasheed Ahmad, Ph.D., principal scientist and head of the Immunology & Microbiology Department at the institute, which was founded by the Kuwait Foundation for the Advancement of Sciences.
To evaluate the effects of sucrose elimination, the team measured glucose tolerance, insulin sensitivity, circulating metabolic hormones, the gut microbiome, and inflammation in both the colon and liver. Despite maintaining similar body weights, mice on the sucrose-free diet experienced poorer glucose control, insulin resistance, imbalances in gut microbes, intestinal inflammation, and changes associated with fatty liver disease. In other words, they traded sugar for a whole host of other problems.
"The findings suggest that complete removal of sucrose from a low-fat diet may negatively affect gut microbiota and metabolic health," Ahmad said. "The study highlights the importance of maintaining balanced dietary carbohydrates to support gut and immune homeostasis." The researchers note that little was previously known about the potential consequences of highly restrictive low-fat diets that eliminate sugar entirely. "This research may influence future dietary recommendations by emphasizing the importance of maintaining a healthy gut microbiome rather than focusing only on sugar restriction," Ahmad added. "In the long term, these findings could help improve strategies for preventing and managing metabolic disorders, fatty liver disease and chronic inflammatory conditions."
The team believes the results underscore the need to consider overall dietary balance rather than concentrating solely on reducing sugar intake. "Studies such as this reflect our institute's commitment to advancing evidence-based scientific discoveries that improve public health outcomes and deepen our understanding of metabolic disease," said Faisal Hamed Al-Refaei, MD, Acting Director General of Dasman Diabetes Institute. Materials were provided by The Endocrine Society, which presumably does not have a sugar lobby.