Salivary AQP9 Identified as Novel Biomarker for Caries and Periodontitis

 A pioneering 2026 study published in Scientific Reports has identified salivary aquaporin-9 (AQP9) mRNA expression as a promising novel biomarker for the prevalence of dental caries and periodontitis, opening new avenues for non-invasive risk assessment and early intervention .

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Dental caries and periodontitis are the most frequently diagnosed dental diseases worldwide, and their occurrence is age-dependent. Due to their widespread prevalence, they represent a major public health challenge. The study, part of the OKAPI prospective observational trial, enrolled 159 patients (40.9% male) from a dental practice and an oral and maxillofacial plastic surgery clinic . Clinical data including the PSI-index and DMFT-Index were recorded, and saliva samples were collected for RNA isolation and quantitative RT-PCR analysis .

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Among the study participants, 39.4% had severe caries and 15.3% had periodontitis. The results demonstrated that AQP9 mRNA expression was significantly increased in patients with severe caries compared to those with milder forms (p = 0.0120). Similarly, increased AQP9 expression was detected in patients with periodontitis compared to unaffected individuals (p = 0.0364) .

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The researchers calculated an AQP9 cut-off value to discriminate between patients with and without severe caries. A binary logistic regression model identified this cut-off as most relevant for identifying risk factors for both caries (p = 0.009) and periodontitis (p = 0.023) . The groups below and above the cut-off differed only in the presence of severe caries or periodontitis and age, suggesting that AQP9 expression serves as an independent predictive marker .

Aquaporins are a family of water channel proteins that facilitate rapid transmembrane water transport. AQP9 is known for its role as a permeable channel for water, glycerol, and other small molecules, and has attracted considerable scientific interest in recent years . The study's authors concluded that AQP9 mRNA expression is associated with the prevalence of caries or periodontitis and could represent a novel biomarker .

This discovery holds significant clinical potential. A salivary biomarker for caries and periodontitis risk would enable non-invasive, cost-effective screening in dental practice settings, allowing clinicians to identify high-risk patients earlier and implement targeted preventive strategies. The trial was registered in the German Clinical Trial Registry (DRKS00032425) and received approval from the medical faculty of Ruhr University Bochum .

Ultra-Processed Foods Linked to Poorer Dental Health in Adults

 A major 2026 study published in Scientific Reports has revealed a significant association between the consumption of ultra-processed foods (UPFs) and poorer dental health outcomes among adults. The research, conducted as part of the Bandare-Kong Non-Communicable Disease (BKNCD) cohort, provides some of the most compelling evidence to date linking modern dietary patterns to oral health deterioration .

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The cross-sectional study analyzed baseline data from 3,947 adults aged 35 to 75 years, with 57.8% of participants being female. Dietary intake was assessed using a validated food frequency questionnaire, and UPFs consumption was classified according to the NOVA system, which categorizes foods based on the extent and purpose of industrial processing . Dental health was evaluated through clinical examinations that measured the number of teeth, missing teeth, decayed teeth, and filled teeth .

The findings were striking. Higher UPFs intake—comparing the highest tertile (T3) to the lowest (T1)—was linked to more decayed teeth in females aged 35–50 years (β = 0.521) and to fewer total teeth (β = −0.976), more missing teeth (β = 0.987), and more decayed teeth (β = 0.536) in females aged 50–75 years. Among males, higher UPFs intake was associated with more missing teeth in those aged 35–50 years (β = 0.387) and with fewer teeth (β = −0.937), more missing teeth (β = 0.911), and more decayed teeth (β = 0.754) in older males .

The study employed structural equation modeling to assess these relationships, incorporating age and gender as potential mediating variables. Age and gender were found to partially mediate the associations between UPFs consumption and dental health, suggesting that the effects of ultra-processed foods on oral health may vary across different demographic groups .

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The researchers noted that UPFs have become a major component of modern diets and have been linked to various adverse health outcomes, but evidence regarding their association with dental health in adults had remained limited prior to this investigation . The study's authors concluded that the findings highlight significant associations between greater UPFs consumption and poorer dental health among Iranian adults, while calling for a longitudinal study to further explore these relationships .

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This research carries important implications for public health policy and clinical practice. It underscores the need for dietary counseling as an integral component of oral health promotion and suggests that reducing ultra-processed food intake could serve as a practical strategy for preserving dental health across aging populations.

Shocking study: Meat could be your key to reaching 100... but with just one condition.

 

For decades, the narrative around healthy aging has largely championed plant-based diets, with vegetarianism and veganism often presented as the gold standard for longevity. A new study from China, however, is challenging that assumption—at least for the very old. The research suggests that for people aged 80 and above, particularly those who are underweight, eating meat may significantly improve the odds of becoming a centenarian.

The Study at a Glance

The research, led by a team from Fudan University in Shanghai, was published in the American Journal of Clinical Nutrition. Scientists analyzed data from the Chinese Longitudinal Healthy Longevity Survey (CLHLS), one of the largest studies on older adults in the world. The cohort included 5,203 participants who were at least 80 years old in 1998 and free of cardiovascular disease, diabetes, and cancer at the start of the study. Over a 20-year follow-up period, 1,459 participants reached the age of 100, while 3,744 died before reaching that milestone.

Approximately 80 percent of the participants reported eating meat, while the remaining 20 percent followed plant-focused diets, including vegetarians, pescatarians, and vegans.

The Key Finding: Weight Matters

The study's headline result is striking: overall, meat eaters were more likely to reach 100 years of age than their vegetarian, pescatarian, or vegan counterparts. However, this difference was statistically significant only when body weight was taken into account.

Among vegetarians with a body mass index (BMI) below 18.5—classified as underweight—24 percent reached the age of 100. In contrast, nearly 30 percent of underweight meat eaters became centenarians, with the likelihood rising further among those who reported eating meat daily. For participants with a BMI above 18.5, the difference in longevity between meat eaters and non-meat eaters disappeared entirely.

A separate analysis by sex revealed that the association was particularly pronounced among women. Female meat eaters were more likely to reach 100 than female vegetarians, while no significant link was found between vegetarianism and longevity among men. The researchers also found that daily meat consumption was associated with a 44 percent higher likelihood of reaching 100 in the underweight group, an association that did not appear in normal-weight or overweight participants.

Why Might Meat Help the Very Old?

The researchers propose a biological explanation rooted in the nutritional needs of aging bodies. As people grow older, they face a heightened risk of malnutrition, muscle wasting (sarcopenia), and bone fragility. Animal proteins provide essential amino acids that help build and maintain muscle mass and bone strength—benefits that may be especially critical for underweight older adults.

Kaiyue Wang, a lead author of the study, noted that older adults tend to have weaker bones and recover poorly after surgery, making their nutritional status a particular concern. The study's findings align with a growing body of research emphasizing the importance of adequate protein intake for healthy aging and the preservation of muscle mass.

Crucially, the study did not find that meat alone was responsible for longevity. Participants who consumed large amounts of vegetables alongside grains and legumes tended to have higher longevity overall, regardless of whether they ate meat. In fact, vegetarians who consumed fish, dairy, or eggs had a similar chance of reaching 100 as meat eaters, suggesting that adequate calorie and nutrient intake—rather than meat specifically—may be the decisive factor.

A Nuanced Picture

The study's authors are careful to frame their findings within a broader context. They emphasize that dietary recommendations for the very old should prioritize balance and adequate nutrition rather than the strict avoidance of animal-based foods, especially for those who are underweight.

Chloe Casey, a lecturer in nutrition at Bournemouth University, offered a similar perspective: "Nutritional priorities shift in later life; the goal becomes preserving muscle mass, preventing weight loss, and ensuring every bite delivers sufficient nutrients". She added that there is no single ideal diet for every life stage—a fiber-rich plant-based diet may suit a person in their forties, while someone in their nineties may need higher calories and protein to avoid malnutrition.

Limitations and Considerations

The study has important limitations. The data come from an exclusively Chinese population with specific dietary habits, so the results may not be fully generalizable to other populations. The observational nature of the research also means it cannot establish causation—it can only identify associations. Furthermore, the study did not analyze the types of meat consumed, leaving open the question of whether the source and quality of meat matter.

The Bottom Line

This study adds a significant wrinkle to the conventional wisdom that plant-based diets are universally superior for longevity. For the very old—particularly those who are underweight—meat may play a protective role by supplying the protein and nutrients needed to maintain muscle and bone health. Yet the broader message is one of balance: a diet rich in vegetables, grains, and legumes remains beneficial at any age, and the best nutritional strategy may depend less on rigid dietary labels and more on the specific needs of the individual at their particular stage of life.

From fruit to sweets: How does your food affect your oral health?

 Every bite affects teeth and gums. Mouth has bacteria. They feed on sugars and carbs, produce acid. Acid attacks enamel. Saliva helps. Diet determines balance.

The science: plaque biofilm. Sugar/refined carbs -> acid for 20 min or more. Frequency. Sticky foods. Acidic foods erode enamel. Calcium/phosphate from saliva and fluoride repair.

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Fruit: Whole fruit has sugar but also water, fiber, vitamins. Chewing stimulates saliva. Apples, pears, berries. But citrus acidic: lemons, oranges, grapefruit. Dried fruit sticky and concentrated sugar: raisins, dates, apricots. Fruit juice/smoothies: sugar and acid, sipping. Better whole fruit with meal, limit juice, use straw? Actually straw can reduce contact but not perfect. Rinse.

Candy: hard candy dissolves slowly, gummies stick in grooves, sour candy acid + sugar, caramels. Worst when eaten slowly or frequently. Chocolate? Plain chocolate melts and washes away easier than sticky, but still sugar. Dark chocolate less sugar? Still moderation.

Other carbs: crackers, chips, bread, pasta ferment. Sticky starches.

Drinks: soda, energy drinks, sweet tea, juice, sports drinks. Acid + sugar. Diet soda acid but no sugar. Coffee/tea can stain, acid, if sugar. Water best. Milk plain.

Protective: cheese raises pH, calcium/phosphate. Yogurt, milk. Nuts, seeds. Crunchy vegetables: carrots, celery, cucumbers. Leafy greens. Water, especially fluoridated. Sugar-free gum with xylitol.

Habits: limit snacking; eat sweets with meals; don't graze. Rinse with water. Wait 30 min after acidic food/drink before brushing to avoid enamel wear. Brush twice daily with fluoride, floss. Regular dental checkups. Chew sugar-free gum. Don't use teeth as tools.

Conclusion: Food is not just nutrition; it's mouth environment. From fruit to candy, choices and frequency matter. Enjoy treats wisely, protect smile.

Need maybe include "not a substitute for professional advice" maybe not necessary. Could include.

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Maybe include subheadings. The user wrote Arabic, but asked article in English. We can maybe start directly.

Let's final.

From Fruit to Candy: How Your Food Affects Your Oral Health

Every meal and snack you eat does more than satisfy hunger. It also feeds the bacteria that live in your mouth. Those bacteria can help or harm your teeth and gums, depending on what you eat, how often you eat it, and how long it stays in contact with your teeth. From a crisp apple to a sticky gummy bear, food plays a major role in oral health.

The Science Behind Food and Cavities

Your mouth is home to hundreds of types of bacteria. Many of them form a sticky film called plaque on your teeth. When you eat foods containing sugars or refined carbohydrates, these bacteria break them down and produce acid. That acid attacks tooth enamel, the hard outer layer that protects your teeth. If acid attacks happen often, enamel begins to break down, leading to cavities.

Saliva helps protect your mouth. It washes away food particles, neutralizes acid, and supplies minerals like calcium and phosphate that help repair early damage. Fluoride from toothpaste and water also helps rebuild enamel. The goal is not to avoid all sugar forever, but to keep the balance in favor of protection rather than damage.

Fruit: Healthy, But Not Harmless

Fruit is an important part of a healthy diet. It provides vitamins, minerals, fiber, and antioxidants. Whole fruits such as apples, pears, and berries also contain water and fiber, which help stimulate saliva and clean the mouth slightly as you chew. In this way, some crunchy fruits can be considered “nature’s toothbrush.”

However, fruit is not automatically good for teeth. Many fruits contain natural sugars, and some are highly acidic. Citrus fruits like oranges, lemons, and grapefruits can erode enamel if eaten frequently. Dried fruits such as raisins, dates, and apricots are especially concerning because they are sticky and concentrated in sugar. They can cling to teeth and feed bacteria for a long time.

Fruit juice and smoothies can also be problematic. They often contain concentrated sugars and acids, and sipping them slowly throughout the day gives teeth repeated acid attacks. Whole fruit is usually a better choice than juice because it requires chewing and contains fiber.

Candy and Sweets: The Biggest Offenders

Candy is one of the most damaging foods for oral health. Hard candy, lollipops, and mints dissolve slowly, bathing teeth in sugar for minutes or even hours. Gummies, caramels, and sticky sweets are even worse because they lodge in the grooves and spaces between teeth, where saliva cannot easily wash them away. Sour candy is a double threat: it contains both sugar and acid.

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Energy Revolution System - Conversions Monster !

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Energy in Costume: The Conversions Monster That Runs the World

Energy is never created or destroyed—it only changes form. This single principle, the law of conservation of energy, turns every physical process on Earth into an endless chain of transformations. Scientists and educators often call this the “Conversions Monster”: a system so vast and interconnected that almost everything we do, from breathing to launching rockets, is really just energy switching costumes.

The Many Faces of Energy

Before we can understand the monster, we need to recognize its many faces:

Kinetic energy – the energy of motion, such as a moving car, flowing water, or a spinning turbine.

Potential energy – stored energy based on position, such as water held behind a dam or a stretched spring.

Thermal energy – heat, produced by the vibration of particles.

Chemical energy – energy stored in molecular bonds, found in food, fossil fuels, and batteries.

Electrical energy – the flow of electric charge.

Nuclear energy – energy locked inside the nucleus of atoms.

Radiant (light) energy – energy carried by electromagnetic waves, such as sunlight.

The Revolution: Chains of Conversion

What makes this system revolutionary is not any single form of energy, but the chains that link those forms together. Consider a simple light bulb powered by a coal plant:

Chemical energy in coal is burned, releasing thermal energy.

That heat boils water, producing steam with kinetic energy.

The steam spins a turbine, converting kinetic energy into mechanical energy.

A generator converts mechanical energy into electrical energy.

The electrical energy travels through wires and becomes light and heat in your bulb.

That is five conversions in a row—and at every single step, some of the original energy is lost as waste heat. This is the “monster” part: conversions are never perfectly efficient. The second law of thermodynamics guarantees that some usable energy will always degrade into low-grade heat, scattered and unrecoverable. A car engine, for example, converts only about 20–30% of gasoline’s chemical energy into motion. The rest disappears as heat and friction.

Why This Matters for the Energy Revolution

Modern energy systems are being redesigned around one central goal: minimizing the monster’s appetite. That means reducing the number of wasteful conversions and choosing more efficient pathways. Instead of burning fuel, boiling water, spinning turbines, and losing energy at every stage, we can increasingly capture sunlight directly, store electricity in batteries, and power devices with fewer intermediate steps.

The Conversions Monster will never disappear. Energy will always change form, and some loss will always occur. But by understanding its chains, we can build a cleaner, smarter, and more efficient energy future—one conversion at a time.

Energy Revolution System - Conversions Monster !

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