Poor oral health linked to abnormal blood test results in older adults
A new study from Japan has uncovered a compelling connection between declining oral health and abnormal blood test results in older adults, highlighting the potential of oral assessments as early warning signs for lifestyle-related diseases.
Published in the Journal of Oral Rehabilitation, the research was led by Professor Mitsuyoshi Yoshida, chair of the Department of Dentistry and Oral-Maxillofacial Surgery at Fujita Health University. The study analyzed data from 118 adults aged 50 and above, all of whom had undergone standard medical check-ups.
“We aimed to clarify whether oral health deterioration correlates with irregular blood markers—particularly those related to glucose metabolism, lipid profiles, and kidney function,” said Professor Yoshida.
Seven oral health markers examined
Researchers gathered data from physical exams and dental screenings conducted between 2021 and 2023. Each participant underwent a comprehensive oral evaluation through seven functional tests, including:
- Tongue coating index (TCI) – to measure oral hygiene
- Oral dryness – indicating salivary gland activity
- Remaining teeth count – a marker of functional dentition
- Maximum tongue pressure – to assess muscular strength
- Masticatory function – evaluating chewing ability
- Swallowing capacity – important for preventing aspiration risks
- Oral diadochokinesis (OD) – testing motor speed and precision through repeated syllable pronunciation
Key results reveal systemic implications
Participants were categorized into two groups based on whether their blood test results—such as fasting blood sugar, HbA1c, cholesterol, and eGFR (kidney function)—fell within standard reference ranges.
Key findings include:
- High blood sugar was significantly associated with fewer functional teeth and lower OD scores, suggesting impaired oral coordination.
- Elevated cholesterol levels correlated with higher TCI values, reflecting poor oral hygiene, and weaker oral motor performance.
- Participants with abnormal kidney function (eGFR) showed notable differences across multiple oral tests, including dryness and tongue pressure.
These patterns suggest that oral health status could serve as a proxy indicator for broader systemic issues, particularly metabolic and cardiovascular health.
Why this matters
The study reinforces the growing understanding that oral health is not isolated from general health. Poor oral hygiene and function are increasingly linked to chronic conditions such as:
- Type 2 diabetes
- Cardiovascular disease
- Kidney dysfunction
By integrating oral function assessments into routine medical check-ups, healthcare providers could catch early signs of disease before symptoms become severe or irreversible.
What the experts recommend
Based on their findings, the researchers recommend that oral screenings and function tests—especially those measuring tongue pressure, chewing, and swallowing—be included in standard health evaluations for adults over 50.
“Oral function testing is a non-invasive, low-cost approach that could significantly enhance disease prevention strategies,” said Professor Yoshida.
This research offers a new dimension to preventive medicine, encouraging stronger collaboration between dental and medical professionals in monitoring age-related health risks.
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