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Vitamin D builds your bones and keeps your gut sealed, among many other essential functions − but many children are deficient

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Vitamin D
Most people in the U.S. get their vitamin D from sun exposure. Stockbyte/DigitalVision via Getty Images

Jacqueline Hernandez, Florida International University and Cristina Palacios, Florida International University

You’ve likely heard about vitamin D’s important role in maintaining strong bones and teeth. But it also plays several other important roles to keep your body healthy – including the function of your gut.

As part of our research on how a dietary fiber supplement affects bone mass in children and adolescents, the MetA-Bone Trial, we are also studying gut health.

For this study, we recruited 213 children and adolescents from South Florida, primarily Hispanics, though some were Black. Before having them start taking the fiber supplement, we measured their vitamin D levels to ensure they had adequate amounts. Surprisingly, we found that 68% of these children had suboptimal vitamin D levels.

Considering South Florida is an area with plenty of sunshine year-round, this was both startling and concerning. While vitamin D can be obtained from foods, most people in the U.S. get this vitamin primarily from skin exposure to sunlight. For youth approaching or experiencing puberty – a period of profound physiological changes, including rapid changes in bone mass – vitamin D deficiency could lead to several health issues.

Silhouette of child walking along the waterline of a beach
Vitamin D deficiency can have significant health consequences. Hrant Khachatryan/Unsplash, CC BY-SA

Connection between vitamin D and health

Vitamin D is involved in so many bodily functions because there are vitamin D receptors in different organs. These receptors act like docking stations for vitamin D to bind to and trigger different effects in the skin, intestine, bone, parathyroid gland, immune system and pancreas, among others.

Vitamin D regulates calcium levels in the body, which is key for not only building and maintaining bone mass but also the basic functioning of the nervous system.

Vitamin D also stimulates cell differentiation, a process in which cells become specialized to carry out specific functions. It is also essential to insulin secretion to control blood sugar levels, blood pressure regulation, muscle repair and regeneration, immune function and nutrient absorption, among many other functions.

Vitamin D and gut health

The vitamin D receptors in your gut improve calcium absorption and strengthen your intestinal barrier.

The intestinal barrier is a layered wall that allows your gut to absorb nutrients and keep out harmful bacteria. This wall is composed of intestinal cells and proteins called tight junctions that act like bricks sealing these cells together. Tight junctions play an important role in maintaining the structure of your intestinal barrier.

Diagram of two cells bound together by strands of protein
Tight junctions keep the cells of your intestine together, forming a selective barrier. VectorMine/iStock via Getty Images Plus

Vitamin D receptors help your gut produce tight junctions to maintain your intestinal barrier. Research suggests that vitamin D deficiency reduces production of the receptors the nutrient binds to, subsequently reducing the seal of the intestinal wall. This weakening of the gut barrier may allow substances from the intestine to pass into the blood, causing inflammation. Disruption of the intestinal barrier is linked to many diseases, including liver disease, Type 1 diabetes, obesity and gastrointestinal conditions such as celiac disease, inflammatory bowel disease and colon cancer.

After discovering that so many of the participants in our MetA-Bone Trial had suboptimal vitamin D levels, we became interested in understanding how this nutrient might be affecting their gut health. For this, we also measured the strength of their intestinal barrier and associated this to their vitamin D levels in blood.

We found that children with suboptimal vitamin D levels had a higher risk of damaging their intestinal barrier compared with children with optimal vitamin D levels. This finding suggests that even in healthy children, suboptimal levels of vitamin D may compromise the gut and potentially increase the risk of developing chronic diseases at an early age.

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Getting enough vitamin D

Vitamin D deficiency is highly prevalent in the U.S. and around the world. Roughly 15.4% of children and adolescents in the U.S. were vitamin D deficient in 2017. While vitamin D deficiency has slightly decreased over time in the general U.S. population, it remains high among teens, especially children with darker skin.

How can you ensure you are getting enough of this important nutrient?

Only a few foods naturally contain vitamin D. For example, vitamin D is naturally found in fatty fish – such as trout, salmon, cod and tuna – egg yolks and mushrooms. Vitamin D can also be found in many fortified foods, such as dairy products like milk and cheese, plant-based milks, breakfast cereals, some orange juice brands and infant formulas. Dietary supplements are also good sources of vitamin D.

Array of foods on a marble surface, including salmon, eggs, mushrooms, cottage cheese and milk
Some foods are good sources of vitamin D. happy_lark/iStock via Getty Images Plus

For most people in the U.S., sun exposure is their main source of vitamin D. However, how much sun exposure you need depends on several factors, such as the melanin content of your skin. Melanin is a pigment that protects your skin from ultraviolet radiation. People with more melanin – and therefore darker skin – produce less vitamin D from sun exposure than those with less melanin and may thus require longer sun exposure to meet minimum requirements.

Since excessive ultraviolet radiation is associated with skin cancer, clinicians typically recommend you meet your vitamin D requirements through foods and beverages. For healthy children and adults, the recommended dietary allowance of vitamin D is 600 IU, with an age-based upper limit of no more than 1,000 to 4,000 IU. You can usually meet this through a healthy diet that includes a variety of whole and unprocessed foods.

Researchers continue to uncover the extensive benefits of vitamin D in the body, supporting its indispensable role in nutrition and health. For growing children and adolescents, enough vitamin D is important for healthy development.

Jacqueline Hernandez, Assistant Professor of Dietetics and Nutrition, Florida International University and Cristina Palacios, Professor and Chair of Dietetics and Nutrition, Florida International University

This article is republished from The Conversation under a Creative Commons license. Read the original article.

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Writing builds resilience by changing your brain, helping you face everyday challenges

Writing builds resilience: Discover how writing changes your brain and strengthens resilience. Learn 5 science-backed writing techniques to process emotions, reduce stress, and navigate everyday challenges with clarity and purpose.

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Last Updated on November 28, 2025 by Daily News Staff

file 20251110 56 29jazm.jpg?ixlib=rb 4.1
Writing is a way of thinking and doing. AscentXmedia/iStock via Getty Images Plus

Writing builds resilience by changing your brain, helping you face everyday challenges

Emily Ronay Johnston, University of California, Merced Ordinary and universal, the act of writing changes the brain. From dashing off a heated text message to composing an op-ed, writing allows you to, at once, name your pain and create distance from it. Writing can shift your mental state from overwhelm and despair to grounded clarity — a shift that reflects resilience. Psychology, the media and the wellness industry shape public perceptions of resilience: Social scientists study it, journalists celebrate it, and wellness brands sell it. They all tell a similar story: Resilience is an individual quality that people can strengthen with effort. The American Psychological Association defines resilience as an ongoing process of personal growth through life’s challenges. News headlines routinely praise individuals who refuse to give up or find silver linings in times of hardship. The wellness industry promotes relentless self-improvement as the path to resilience. In my work as a professor of writing studies, I research how people use writing to navigate trauma and practice resilience. I have witnessed thousands of students turn to the written word to work through emotions and find a sense of belonging. Their writing habits suggest that writing fosters resilience. Insights from psychology and neuroscience can help explain how.

Writing rewires the brain

In the 1980s, psychologist James Pennebaker developed a therapeutic technique called expressive writing to help patients process trauma and psychological challenges. With this technique, continuously journaling about something painful helps create mental distance from the experience and eases its cognitive load. In other words, externalizing emotional distress through writing fosters safety. Expressive writing turns pain into a metaphorical book on a shelf, ready to be reopened with intention. It signals the brain, “You don’t need to carry this anymore.”
Person sitting at a table writing in a notebook
Sometimes you can write your way through difficult emotions. Grace Cary/Moment via Getty Images
Translating emotions and thoughts into words on paper is a complex mental task. It involves retrieving memories and planning what to do with them, engaging brain areas associated with memory and decision-making. It also involves putting those memories into language, activating the brain’s visual and motor systems. Writing things down supports memory consolidation — the brain’s conversion of short-term memories into long-term ones. The process of integration makes it possible for people to reframe painful experiences and manage their emotions. In essence, writing can help free the mind to be in the here and now.

Taking action through writing

The state of presence that writing can elicit is not just an abstract feeling; it reflects complex activity in the nervous system. Brain imaging studies show that putting feelings into words helps regulate emotions. Labeling emotions — whether through expletives and emojis or carefully chosen words — has multiple benefits. It calms the amygdala, a cluster of neurons that detects threat and triggers the fear response: fight, flight, freeze or fawn. It also engages the prefrontal cortex, a part of the brain that supports goal-setting and problem-solving. In other words, the simple act of naming your emotions can help you shift from reaction to response. Instead of identifying with your feelings and mistaking them for facts, writing can help you simply become aware of what’s arising and prepare for deliberate action. Even mundane writing tasks like making a to-do list stimulate parts of the brain involved in reasoning and decision-making, helping you regain focus.

Making meaning through writing

Choosing to write is also choosing to make meaning. Studies suggest that having a sense of agency is both a prerequisite for, and an outcome of, writing. Researchers have long documented how writing is a cognitive activity — one that people use to communicate, yes, but also to understand the human experience. As many in the field of writing studies recognize, writing is a form of thinking — a practice that people never stop learning. With that, writing has the potential to continually reshape the mind. Writing not only expresses but actively creates identity. Writing also regulates your psychological state. And the words you write are themselves proof of regulation — the evidence of resilience. Popular coverage of human resilience often presents it as extraordinary endurance. News coverage of natural disasters implies that the more severe the trauma, the greater the personal growth. Pop psychology often equates resilience with unwavering optimism. Such representations can obscure ordinary forms of adaptation. Strategies people already use to cope with everyday life — from rage-texting to drafting a resignation letter — signify transformation.

Building resilience through writing

These research-backed tips can help you develop a writing practice conducive to resilience: 1. Write by hand whenever possible. In contrast to typing or tapping on a device, handwriting requires greater cognitive coordination. It slows your thinking, allowing you to process information, form connections and make meaning. 2. Write daily. Start small and make it regular. Even jotting brief notes about your day — what happened, what you’re feeling, what you’re planning or intending — can help you get thoughts out of your head and ease rumination. 3. Write before reacting. When strong feelings surge, write them down first. Keep a notebook within reach and make it a habit to write it before you say it. Doing so can support reflective thinking, helping you act with purpose and clarity. 4. Write a letter you never send. Don’t just write down your feelings — address them to the person or situation that’s troubling you. Even writing a letter to yourself can provide a safe space for release without the pressure of someone else’s reaction. 5. Treat writing as a process. Any time you draft something and ask for feedback on it, you practice stepping back to consider alternative perspectives. Applying that feedback through revision can strengthen self-awareness and build confidence. Resilience may be as ordinary as the journal entries people scribble, the emails they exchange, the task lists they create — even the essays students pound out for professors. The act of writing is adaptation in progress.The Conversation Emily Ronay Johnston, Assistant Teaching Professor of Global Arts, Media and Writing Studies, University of California, Merced This article is republished from The Conversation under a Creative Commons license. Read the original article.

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Joyful Thanksgiving: Celebrate and Give Thanks!

Celebrate Thanksgiving with joy and gratitude, as we come together to give thanks for all the blessings in our lives.

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Last Updated on November 27, 2025 by Daily News Staff

Happy Thanksgiving!
Happy thanksgiving

Wishing you all a Happy Thanksgiving! As we gather with loved ones to express gratitude and share a meal, let’s take a moment to appreciate the blessings in our lives. It’s a time to reflect on the goodness that surrounds us and cherish the moments of joy and togetherness. Whether you’re celebrating with family, friends, or even virtually, may this Thanksgiving be filled with warmth, love, and laughter. Let’s remember to extend kindness and lend a helping hand to those in need, spreading the spirit of gratitude and generosity. Enjoy the holiday and create beautiful memories. Happy Thanksgiving!

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  • Rod Washington

    Rod: A creative force, blending words, images, and flavors. Blogger, writer, filmmaker, and photographer. Cooking enthusiast with a sci-fi vision. Passionate about his upcoming series and dedicated to TNC Network. Partnered with Rebecca Washington for a shared journey of love and art.

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Food and Beverage

Don’t let food poisoning crash your Thanksgiving dinner

Safe thanksgiving dinner: Protect your Thanksgiving guests from foodborne illness with these expert food safety tips. Learn why you shouldn’t wash your turkey, how to avoid the danger zone, and essential prep strategies to prevent the 48 million annual cases of food poisoning in the U.S.

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Last Updated on November 26, 2025 by Daily News Staff

Don’t let food poisoning crash your Thanksgiving dinner
Undercooked turkey is a leading cause of foodborne illness on Thanksgiving. AlexRaths/iStock via Getty Images Plus

Don’t let food poisoning crash your Thanksgiving dinner

Lisa Cuchara, Quinnipiac University Thanksgiving is a time for family, friends and feasting. However, amid the joy of gathering and indulging in delicious food, it is essential to keep food safety in mind. Foodborne illnesses can quickly put a damper on your celebrations. As an immunologist and infectious disease specialist, I study how germs spread – and how to prevent them from doing so. In my courses, I teach my students how to reduce microbial risks, including those tied to activities such as hosting a big Thanksgiving gathering, without becoming germophobes. Foodborne illnesses sicken 48 million Americans – 1 in 6 people – each year. Holiday meals such as Thanksgiving pose special risks because these spreads often involve large quantities, long prep times, buffet-style serving and mingling guests. Such conditions create many opportunities for germs to spread. This, in turn, invites a slew of microbial guests such as Salmonella and Clostridium perfringens. Most people recover from infections with foodborne bacteria, but each year around 3,000 Americans die from the illnesses they cause. More routinely, these bugs can cause nausea, vomiting, stomach cramps and diarrhea within hours to a couple of days after being consumed – which are no fun at a holiday celebration.

Foods most likely to cause holiday illness

Most foodborne illnesses come from raw or undercooked food and foods left in the so-called danger zone of cooking temperature – 40 degrees to 140 degrees Fahrenheit – in which bacteria multiply rapidly. Large-batch cooking without proper reheating or storage as well as cross contamination of foods during preparation can also cause disease.
A turkey on a counter being stuffed by two sets of hands.
Put that bird right in the oven as soon as you’ve stuffed it to keep bacteria from multiplying inside. kajakiki/E+ via Getty Images
Not all dishes pose the same risk. Turkey can harbor Salmonella, Campylobacter and Clostridium perfringens. Undercooked turkey remains a leading cause of Thanksgiving-related illness. Raw turkey drippings can also easily spread bacteria onto hands, utensils and counters. And don’t forget the stuffing inside the bird. While the turkey may reach a safe internal temperature, the stuffing often does not, making it a higher-risk dish. Leftovers stored too long, reheated improperly or cooled slowly also bring hazards. If large pieces of roasted turkey aren’t divided and cooled quickly, any Clostridium perfringens they contain might have time to produce toxins. This increases the risk of getting sick from snacking on leftovers – even reheated leftovers, since these toxins are not killed by heat. Indeed, each November and December outbreaks involving this bacterium spike, often due to encounters with turkey and roast beef leftovers.

Don’t wash the turkey!

Washing anything makes it cleaner and safer, right? Not necessarily. Many people think washing their turkey will remove bacteria. However, it’s pretty much impossible to wash bacteria off a raw bird, and attempting to do so actually increases cross contamination and your risk of foodborne illness. Since 2005, federal food safety agencies have advised against washing turkey or chicken. Despite this, a 2020 survey found that 78% of people still reported rinsing their turkey before cooking – often because older recipes or family habits encourage it. When you rinse raw poultry, water can splash harmful bacteria around your kitchen, contaminating counter tops, utensils and nearby foods. If you do choose to wash turkey, it’s critical to immediately clean and disinfect the sink and surrounding area. A 2019 USDA study found that 60% of people who washed their poultry had bacteria in their sink afterward – and 14% had bacteria in the sink even after cleaning it.
Family enjoying Thanksgiving meal
A few food prep precautions can help keep the holiday free of gastrointestinal distress. Drazen Zigic/iStock via Getty Images Plus

Food prep tips for a safe and healthy Thanksgiving

Wash your hands regularly. Before cooking and after touching raw meat, poultry or eggs, wash your hands thoroughly with soap and water for at least 20 seconds. Improper handwashing by people handling food is a major source of bacterial contamination with Staphylococcus aureus. This bacterium’s toxins are hard to break down, even after cooking or reheating. Thaw turkey safely. The safest way to thaw a turkey is in the refrigerator. Allow 24 hours per 4-5 pounds. There’s also a faster method, which involves submerging the turkey in cold water and changing the water every 30 minutes – but it’s not as safe because it requires constant attention to ensure the water temperature stays below 40 F in order to prevent swift bacteria growth. Stuff your turkey immediately before cooking it. Stuffing the turkey the night before is risky because it allows bacteria in the stuffing to multiply overnight. The toxins produced by those bacteria do not break down upon cooking, and the interior of the stuffing may not get hot enough to kill those bacteria. The USDA specifically warns against prestuffing. So cook stuffing separately, if possible, or if you prefer it inside the bird, stuff immediately before roasting, making sure it reaches 165 F. Cook food to the right temperature. A thermometer is your best friend – use it to ensure turkey and stuffing both reach 165 F. Check casseroles and other dishes too. It’s best not to rely on an internal pop-up thermometer, since they can be inaccurate, imprecise and could even malfunction. Avoid cross contamination. Use separate cutting boards for raw meat, vegetables and bread. Change utensils and plates after handling raw meat before using them for cooked foods. Keep food at safe temperatures. Serve hot foods immediately, and make sure hot foods are served above 140 F and cold dishes below 40 F to keep them out of the microbial danger zone. Be cautious with buffet-style serving. Limit food time on the table to two hours or less – longer than that, any bacteria present can double every 20 minutes. Provide dedicated serving utensils, and avoid letting guests serve with utensils they have eaten from. Be mindful of expiration dates. Don’t forget to check dates on food items to make sure that what you are serving isn’t expired or left from last Thanksgiving. Educate guests on food safety. Remind guests to wash their hands before preparing or serving food, and politely discourage double-dipping or tasting directly from communal dishes. Thanksgiving should be a time of gratitude, not gastrointestinal distress. By following these simple food safety tips, you can help ensure a safe and healthy holiday. Lisa Cuchara, Professor of Biomedical Sciences, Quinnipiac University This article is republished from The Conversation under a Creative Commons license. Read the original article.

Our Lifestyle section on STM Daily News is a hub of inspiration and practical information, offering a range of articles that touch on various aspects of daily life. From tips on family finances to guides for maintaining health and wellness, we strive to empower our readers with knowledge and resources to enhance their lifestyles. Whether you’re seeking outdoor activity ideas, fashion trends, or travel recommendations, our lifestyle section has got you covered. Visit us today at https://stmdailynews.com/category/lifestyle/ and embark on a journey of discovery and self-improvement.


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