A Five-Day Fasting Diet Could Help Ease Gum Disease Inflammation

A small trial suggests fasting may reduce inflammation after deep dental cleaning.

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Periodontitis may begin in the narrow space between tooth and gum. But the immune response it sets off can reach far beyond the mouth.

In periodontitis, bacteria around the teeth provoke an immune response that can destroy the tissues holding teeth in place. Dentists treat it by cleaning deep below the gum line. But that treatment itself can briefly stir up inflammation before healing begins.

Now, a small, randomized trial suggests that a fasting-like diet may help reduce inflammation in people being treated for severe gum disease. Patients who followed the diet did not heal faster, and their gum pockets did not improve more than those of patients who ate normally. But they did show lower levels of inflammatory molecules in blood and gum fluid after treatment, pointing to a possible role for diet as an add-on to dental care

“Our study suggests lifestyle modifications could be important alongside proper tooth brushing for patients,” said Dr. Giuseppe Mainas of King’s College London.

The Mouth Is Not Separate From the Body
Severe periodontal disease affects more than 1 billion people worldwide, according to the World Health Organization. Researchers also increasingly view gum disease as part of a broader inflammatory network, linked in studies with diabetes, cardiovascular disease and other chronic conditions.

The new trial, published in the Journal of Clinical Periodontology, enrolled 28 adults with advanced periodontitis at five university hospitals in Spain. All received standard non-surgical periodontal treatment, including oral hygiene support and full-mouth cleaning under the gum line.

Half continued their normal diet. Half followed three cycles of a commercial fasting-mimicking diet, ProLon. Each cycle lasted five days: 1,100 calories for two days, then 750 calories for three days. The cycles began on the day of dental treatment, then repeated about 45 and 85 days later.

The researchers took blood and gingival crevicular fluid, the liquid that seeps from the small space between tooth and gum. They tracked C-reactive protein (CRP) a common marker of inflammation, along with inflammatory molecules in gum fluid.

After six months, 27 participants completed the study. The fasting group showed lower later levels of several inflammatory markers, including CRP in blood and MMP-8 and IL-6 in gum fluid. But their gums did not heal faster or better than those of the control group. Both groups improved after cleaning, and clinical measures did not differ significantly.

“The tested intervention resulted in changes in local and systemic inflammatory responses; however, these findings should be interpreted as exploratory,” the authors wrote in the academic paper.

A Signal, Not a Prescription
This was a feasibility pilot, not a definitive clinical trial. It relied on food diaries rather than biochemical proof that participants were fasting. It did not collect metabolic markers such as ketones, glucose or insulin. The groups also differed somewhat in sex balance, to name a few limitations and caveats from the study.

Still, the result fits a larger trend. King’s College London researchers recently reported that people who more closely followed a Mediterranean-style diet tended to have better gum health and lower inflammation. Other work on fasting-mimicking diets has linked repeated five-day cycles to changes in blood and liver markers associated with lower biological age and disease risk.

Prof. Luigi Nibali of King’s College London offered several possible explanations, while stressing that researchers still need more evidence.

“There may be multiple reasons why fasting is beneficial to gum disease patients,” he said. “Fasting reduces oxidative stress in the body, a common cause of inflammation, which can damage cells and DNA.”

He added: “Intake of high calorific foods and refined carbohydrates, for example in cakes and biscuits, can also cause inflammation — so restricting these foods also reduces oxidative stress in the body.”

Caveats in Fasting Diets
The diet was apparently manageable for the small group studied. All participants assigned to the fasting-mimicking diet reported completing the three cycles. Five reported minor side effects, including fatigue, headache, nausea or constipation. No serious adverse events occurred.

But fasting can be risky for some people, including those with diabetes, eating disorders, frailty, pregnancy or medication schedules that depend on regular meals. Mainas said that future advice would need to be targeted, adding that the team wants a larger study before considering whether this approach belongs in periodontal care.

One more caveat deserves attention. L-Nutra, the company that makes ProLon, provided the diet kits. Valter Longo, one of the paper’s authors, disclosed equity in L-Nutra and patents related to the diet. However, the study states that laboratory analyses and statistics were performed independently.

For now, the message is not to skip meals instead of seeing a dentist. The study suggests that diet may influence the inflammatory response to periodontal treatment, but it did not show that fasting improves gum disease itself.