Red in the Kitchen, White in the Smile: Can a Tomato Nutrient Ward Off Severe Gum Disease?

NEW LONDON, Conn. — A new study involving a multi-institutional team of researchers suggests that a common nutrient found in tomatoes may be a powerful ally in the fight against severe gum disease among older Americans. The research, published in The Journal of Nutrition, Health and Aging, reveals that adults aged 65 to 79 who lack sufficient lycopene in their diets face significantly higher risks of severe periodontitis—though the protective benefits may vary notably across different demographic groups.

As the U.S. population ages, oral health has become a focal point of public health discussions. Periodontitis, a chronic inflammatory condition that destroys the soft tissue and bone supporting the teeth, is more than just a matter of a bright smile; it is increasingly linked to systemic issues like heart disease and diabetes.

The Lycopene Connection

The study, led by Katherine Kwong of Connecticut College, analyzed health and nutrition data from 1,227 participants in the National Health and Nutrition Examination Survey (NHANES). The findings were stark: nearly half of the participants (48.7%) suffered from some form of periodontitis. Simultaneously, a staggering 77.9% of the group fell short of adequate lycopene intake.

Lycopene is a carotenoid—a natural pigment and potent antioxidant—that gives tomatoes, watermelons, and pink grapefruits their vibrant red hue. In the body, antioxidants help neutralize “free radicals,” unstable molecules that can damage cells and fuel inflammation.

The researchers found that after adjusting for smoking, education, and age, those who consumed adequate levels of lycopene were far less likely to suffer from the most debilitating forms of gum disease. In fact, their odds of severe periodontitis were roughly one-third of those who did not get enough of the nutrient.

“This research highlights a potentially modifiable risk factor,” says Dr. Elena Rossi, a periodontist not involved in the study. “While we’ve long known that nutrition impacts oral health, seeing such a specific correlation between a single antioxidant like lycopene and severe bone loss in older adults is compelling.”

Disparities in Risk: Sex and Race

One of the most significant aspects of the Kwong study is the identification of clear disparities in how gum disease affects different populations. The data showed that severe periodontitis does not strike equally:

• Sex: Men were significantly more likely to experience severe gum disease than women. The study found women had an odds ratio of 0.27 (75.3% lower odds) compared to men for developing the severe form of the condition.

• Race: Non-Hispanic Black adults faced a much higher burden, with odds of severe periodontitis nearly three times higher (OR 2.82) than their non-Hispanic White counterparts.

Interestingly, the protective association of lycopene was most pronounced among non-Hispanic White participants. Among non-Hispanic Black participants, the same clear link between lycopene intake and reduced risk was not observed.

“The lack of a lycopene association in Black adults suggests that the drivers of periodontal disease may be multifactorial, involving genetics, access to dental care, or other environmental stressors that a single nutrient cannot overcome,” explains Marcus Thorne, a public health researcher specializing in health equity. “It underscores the need for tailored health interventions rather than a one-size-fits-all approach.”

The “Tomato Effect”: Why Lycopene?

The biological mechanism behind the findings likely lies in lycopene’s anti-inflammatory properties. Periodontitis is driven by an overactive immune response to bacteria in dental plaque. This inflammation eventually leads to the breakdown of the periodontal ligament and alveolar bone.

“Think of lycopene as a cellular shield,” says Dr. Rossi. “By dampening the oxidative stress in the gingival tissues, it may prevent the inflammatory ‘fire’ from spreading and causing permanent structural damage to the jaw.”

However, the researchers were quick to note the study’s limitations. Because the data was cross-sectional—meaning it captured a snapshot of health at a single point in time—it cannot prove that eating more tomatoes causes better gum health. It only proves they are strongly linked.

Practical Implications for Older Adults

For the average consumer, these findings suggest that “eating the rainbow” is more than just a colorful suggestion. Increasing intake of lycopene-rich foods may be a low-cost, low-risk way to support dental longevity.

Top Sources of Lycopene:

1. Cooked Tomato Products: Ironically, the body absorbs lycopene better from processed tomatoes (sauce, paste, or soup) than from raw ones, as heat breaks down the plant’s cell walls.

2. Watermelon: A refreshing source that is also hydrating.

3. Pink Grapefruit and Guava: Excellent fruit-based options.

4. Papaya: Another tropical source of the antioxidant.

While supplements are available, most nutritionists recommend getting nutrients from whole foods first to benefit from the complex matrix of vitamins and minerals they provide.

Looking Ahead

The study authors recommend that future prevention strategies for oral health should consider race- and sex-specific dietary interventions. They are also calling for longitudinal studies—tracking participants over many years—to see if increasing lycopene intake can actually slow the progression of existing gum disease.

For now, the message for older adults remains clear: dental health is an integral part of overall wellness, and what you put on your plate may be just as important as how often you brush and floss.

Medical Disclaimer

Medical Disclaimer: This article is for informational purposes only and should not be considered medical advice. Always consult with qualified healthcare professionals before making any health-related decisions or changes to your treatment plan. The information presented here is based on current research and expert opinions, which may evolve as new evidence emerges.

References

• Study Citation: Kwong, K., Lu, Y., Li, Z., Luo, S., Huang, Z., Chen, Z., Zhao, N., & Tseng, T.-S. (2025). Lycopene, Race and Periodontitis: Disparities in Older Adults. The Journal of Nutrition, Health and Aging. DOI: 10.1016/j.jnha.2025.100759.