A new study presented at ENDO 2026, the annual meeting of the Endocrine Society, suggests that completely cutting sucrose from the diet could harm gut health and interfere with normal metabolic function.

The research, led by the Dasman Diabetes Institute in Kuwait City, examined how a total absence of dietary sugar impacts the body.

The findings indicate that giving up sugar entirely may have unforeseen consequences, particularly for gut bacteria and inflammation levels.

Researchers conducted a 16-week study on two groups of mice, both following a low-fat diet.

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The only difference was that one group’s diet included regular amounts of sucrose, while the other group’s diet contained none.

Throughout the experiment, scientists closely tracked each group’s weight, glucose tolerance, insulin sensitivity, hormonal activity, levels of internal inflammation, and the composition of their gut microbiota.

According to the study’s press release, the mice that consumed no sucrose developed notable imbalances in their gut microbes and experienced increased intestinal and liver inflammation.

They also presented early biological markers linked to fatty liver disease, despite not gaining any weight.

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"Completely removing sucrose from a low-fat diet may unexpectedly disrupt gut health and promote inflammation and metabolic dysfunction," said Rasheed Ahmad, principal scientist and head of the Immunology & Microbiology Department at the Dasman Diabetes Institute.

The sugar-free mice also showed reduced glucose regulation and signs of insulin resistance, which further suggested that entirely eliminating sugar might interfere with metabolic stability.

While diets high in sugar are well known to carry health risks, Ahmad and his team pointed out that far less research has focused on what happens when sugar is completely eliminated from low-fat meals.

Their findings highlight that carbohydrates can be important for keeping a healthy balance between the immune system and the gut microbiome.

The study raises questions about whether total sugar bans are truly beneficial. Ahmad noted that the data indicate how a small amount of sucrose may actually help maintain microbial diversity and metabolic health under certain dietary conditions.

"These findings suggest that complete removal of sucrose from a low-fat diet may negatively affect gut microbiota and metabolic health," Ahmad added.

Scientists emphasized that the research was conducted only on mice during a 16-week timeframe. More clinical trials on humans will be needed to determine whether the same effects occur in people who remove all sugar from their diets.

The authors also noted that the study was limited to low-fat meal plans. Therefore, the results might not apply to sugar elimination within high-fat or ketogenic diets.

Future dietary guidelines, the researchers suggested, may move away from strict anti-sugar policies and instead focus on balanced nutrition that supports a healthy gut microbiome.

Ahmad said the findings could eventually help shape new approaches for managing metabolic disorders, fatty liver disease, and chronic inflammation.

The results underscore an evolving understanding of nutrition science—one that considers not only how much sugar people eat,

but also how sugar interacts with other nutrients to maintain digestive and metabolic balance.