A study presented at the Endocrine Society's annual meeting, ENDO 2026, suggests that completely removing sugar from a low-fat diet may lead to unintended negative consequences for gut health and the body's metabolism. The research indicates that a total lack of sucrose, commonly known as table sugar, could disrupt the natural balance of gut bacteria and promote inflammation.
Researchers at the Dasman Diabetes Institute in Kuwait City conducted a 16-week study involving two groups of mice on identical low-fat diets. The key difference was that one group consumed a standard amount of sucrose, while the other group's diet contained no sugar at all. Throughout the experiment, scientists closely monitored various physiological markers, including weight, glucose tolerance, insulin sensitivity, hormone levels, internal inflammation, and the composition of gut microbiota.
The findings revealed that the complete absence of dietary sugar led to several unexpected health issues in the mice. According to Rasheed Ahmad, principal scientist and head of the Immunology & Microbiology Department at the Dasman Diabetes Institute, "Completely removing sucrose from a low-fat diet may unexpectedly disrupt gut health and promote inflammation and metabolic dysfunction."
Despite not gaining extra weight compared to the control group, the mice on the sugar-free diet exhibited a deterioration in their internal health indicators. They developed an imbalance in their gut microbes and experienced increased inflammation in their intestines and liver. The research also showed signs of impaired glucose regulation, insulin resistance, and cellular changes associated with fatty liver disease.
"The findings suggest that complete removal of sucrose from a low-fat diet may negatively affect gut microbiota and metabolic health," Ahmad stated.
While the detrimental effects of high-sugar diets are well-documented, the researchers highlighted that the impact of entirely eliminating sugar from low-fat meals has received less attention. These new findings suggest that dietary carbohydrates play an important role in maintaining the balance between the immune system and the gut microbiome.
However, the researchers cautioned that because the study was conducted on mice over a relatively short 16-week period, further clinical trials are needed to determine if a completely sugar-free diet causes similar gut and liver inflammation in humans. Additionally, the study focused specifically on the elimination of sucrose from low-fat diets, so the results may not be applicable to individuals who are removing sugar while following higher-fat or ketogenic eating plans.
Scientists believe these findings could lead to a shift in future dietary guidelines, moving away from strict, absolute sugar bans towards a greater emphasis on overall gut health through balanced nutrition. Ahmad noted that in the long term, these insights could aid in developing improved strategies for preventing and managing metabolic disorders, fatty liver disease, and chronic inflammatory conditions.