Always on a sugar cut? New study warns of the dark side of a ‘no sugar’ diet

It’s not deadly viruses or AI advancements that scare most people nowadays, but sugar. Most people, especially youngsters today, consider sugar to be the enemy. Wellness gurus urge you to eliminate it from your kitchen right now.

Fitness trainers, on the other hand, ask you to cut it out completely. And the results? Healthier, slimmer, and more energised. Removing sugar from the diet has become the holy grail of overall wellness. While excessive sugar consumption is linked to lifestyle diseases, removing it completely may do more harm than good. At least that’s what a new study presented at ENDO 2026, the Endocrine Society's annual meeting in Chicago, suggests.

What happens if you cut sugar completely

Of late, fitness enthusiasts, wellness influencers, and many ordinary individuals have been singing the same tune: sugar is bad for your health. But the new groundbreaking study suggests that eliminating sugar from your diet may be more detrimental than previously thought.“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,” Rasheed Ahmad, PhD, principal scientist and head of the Immunology & Microbiology Department at the Dasman Diabetes Institute in Kuwait City, said.

The findings were based on an animal study.The researchers compared the effects of a sucrose-free low-fat diet with a sucrose-containing low-fat control diet in two groups of mice over 16 weeks. They recorded glucose tolerance, insulin sensitivity, circulating metabolic hormones, the gut microbiome, and inflammation in the colon and liver of the mice.

Why a sugar cut may not always be ‘healthy’

The researchers noted that mice fed a sugar-free diet developed impaired glucose control, insulin resistance, gut microbial imbalance, intestinal inflammation, and fatty liver changes, even though their body weight remained similar to that of the control group.

“The findings suggest that complete removal of sucrose from a low-fat diet may negatively affect gut microbiota and metabolic health. The study highlights the importance of maintaining balanced dietary carbohydrates to support gut and immune homeostasis,” Ahmad said.Until now, the impact of removing sugar from a low-fat diet was unknown. Removing sugar entirely from the diet may not necessarily benefit you, contrary to what most people believe.“This research may influence future dietary recommendations by emphasising the importance of maintaining a healthy gut microbiome rather than focusing only on sugar restriction. In the long term, these findings could help improve strategies for preventing and managing metabolic disorders, fatty liver disease, and chronic inflammatory conditions,” Ahmad added.“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,” Faisal Hamed Al-Refaei, MD, Acting Director General of Dasman Diabetes Institute, said.This does not mean you should abandon all dietary caution and return to sugary sodas and sweets. Rather, it suggests that moderate, balanced nutrition beats restrictive elimination every time. The keyword here is balance. And, of course, that again depends on your current health condition.