Researchers at King's College London have identified a surprising connection between short-term fasting and improved gum disease markers, suggesting that calorie restriction may work alongside traditional dental treatments to combat one of the most common oral health problems.
The pilot study involved 28 patients recruited from hospitals across Spain who were divided into two groups. One group followed a specially designed five-day fasting cycle repeated three times over six months, while the other maintained their normal eating habits. The fasting protocol required participants to consume 1,100 calories daily for the first two days, then drop to 750 calories for the next three days before gradually reintroducing soft foods and returning to regular meals. Participants reported the regimen was manageable to follow.
After six months, blood samples and gingival crevicular fluid, which is the protective liquid between teeth and gums, showed markedly lower inflammation markers in the fasting group compared with controls. Specifically, those who completed the fasting program demonstrated reduced levels of C-reactive protein, a standard inflammatory indicator, as well as molecules directly linked to gum inflammation.
Periodontitis, the severe form of gum disease affecting millions worldwide, has been linked to serious conditions including heart disease and diabetes. Current treatment typically focuses on professional plaque removal and patient hygiene practices, but researchers increasingly believe dietary intervention could enhance outcomes.
Prof Luigi Nibali, senior author of the research, explained several potential mechanisms. "Fasting reduces oxidative stress, a primary driver of inflammation that damages cells and DNA," he noted. High-calorie and refined carbohydrate consumption can trigger inflammatory responses in the body, so restricting them addresses a root cause. Nibali also suggested fasting may alter the body's microbiome, though he emphasized further investigation is needed.
Dr. Giuseppe Mainas, the study's lead author, said the findings open new treatment possibilities. "Our study suggests lifestyle modifications could be important alongside proper tooth brushing for patients," he stated.
The team plans larger clinical trials before potentially incorporating fasting-mimicking diets into standard gum disease protocols. However, researchers acknowledge practical limitations. Certain populations, particularly those with diabetes, may find calorie restriction dangerous, requiring a targeted approach to specific patient groups considered at higher risk.
The research builds on prior work from King's College London demonstrating that the Mediterranean diet reduces gum disease and that successful dental treatment lowers the risk of developing diabetes and heart disease. The findings were published in the Journal of Clinical Periodontology and supported by a Medical Research Council-Impact Accelerator Account grant.
Author Jessica Williams: "If fasting can genuinely reduce gum inflammation, dentists may finally have a non-invasive tool that patients can actually control between appointments, but the diabetes risk caveat is real and needs serious attention before rolling this out widely."
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