Lifestyle
Why winter makes you more vulnerable to colds – a public health nurse explains the science behind the season

Libby Richards, Purdue University
You’ve probably heard “Don’t go outside in the winter with your hair wet or without a coat; you’ll catch a cold.”
That’s not exactly true. As with many things, the reality is more complicated. Here’s the distinction: Being cold isn’t why you get a cold. But it is true that cold weather makes it easier to catch respiratory viruses such as the cold and flu.
Research also shows that lower temperatures are associated with higher COVID-19 rates.
As a professor of nursing with a background in public health, I’m often asked about infectious disease spread, including the relationship between cold and catching a cold. So here’s a look at what actually happens.
Many viruses, including rhinovirus – the usual culprit for the common cold – influenza, and SARS-CoV-2, the virus that causes COVID-19, remain infectious longer and replicate faster in colder temperatures and at lower humidity levels. This, coupled with the fact that people spend more time indoors and in close contact with others during cold weather, are common reasons that germs are more likely to spread.
The flu and respiratory syncytial virus, or RSV, tend to have a defined fall and winter seasonality. However, because of the emergence of new COVID-19 variants and immunity from previous infections and vaccinations decreasing over time, COVID-19 is not the typical cold-weather respiratory virus. As a case in point, COVID-19 infection rates have surged every summer since 2020.
Virus transmission is easier when it’s cold
More specifically, cold weather can change the outer membrane of the influenza virus, making it more solid and rubbery. Scientists believe that the rubbery coating makes person-to-person transmission of the virus easier.
It’s not just cold winter air that causes a problem. Air that is dry in addition to cold has been linked to flu outbreaks. That’s because dry winter air further helps the influenza virus to remain infectious longer. Dry air, which is common in the winter, causes the water found in respiratory droplets to evaporate more quickly. This results in smaller particles, which are capable of lasting longer and traveling farther after you cough or sneeze.
How your immune system responds during cold weather also matters a great deal. Inhaling cold air may adversely affect the immune response in your respiratory tract, which makes it easier for viruses to take hold. That’s why wearing a scarf over your nose and mouth may help prevent a cold because it warms the air that you inhale. https://www.youtube.com/embed/7JQ78oLFV9A?wmode=transparent&start=0 Cold weather can affect nasal immunity.
Also, most people get less sunlight in the winter. That is a problem because the sun is a major source of vitamin D, which is essential for immune system health. Physical activity, another factor, also tends to drop during the winter. People are three times more likely to delay exercise in snowy or icy conditions.
Instead, people spend more time indoors. That usually means more close contact with others, which leads to disease spread. Respiratory viruses generally spread within a 6-foot radius of an infected person.
In addition, cold temperatures and low humidity dry out your eyes and the mucous membranes in your nose and throat. Because viruses that cause colds, flu and COVID-19 are typically inhaled, the virus can attach more easily to these impaired, dried-out passages.
What you can do
The bottom line is that being wet and cold doesn’t make you sick. That being said, there are strategies to help prevent illness all year long:

- Avoid touching your face, something people do between nine and 23 times an hour.
- Stay hydrated. Eight glasses a day of water is a good goal, but that could be more or less depending on lifestyle and the size of the person.
- Eat a well-balanced diet. Dark green, leafy vegetables are rich in immune system-supporting vitamins, while eggs, fortified milk, salmon and tuna have vitamin D.
- Stay physically active, even during the winter.
- Get adequate sleep.
- Clean hard, high-touch surfaces in your home often.
- If your nose or throat gets dry in the winter, consider using a humidifier.
- Get your annual flu and COVID-19 vaccine.
Following these tips can ensure you have a healthy winter season.
This is an updated version of an article originally published on Dec. 15, 2020.
Libby Richards, Professor of Nursing, Purdue 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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Community
Celebrating National Nutrition Month: A Heartfelt Tribute to Nourishing Seniors
On March 19, 2025, Tanner Terrace residents celebrated National Nutrition Month with a community event led by Diana Gregory Outreach Services, focusing on healthy eating and nutrition education for seniors.

March 19, 2025, marked a significant day for the residents of Tanner Terrace in Glendale, Arizona, as they came together to celebrate National Nutrition Month. The event, held from 2 PM to 3:30 PM, aimed to emphasize the importance of healthy eating among seniors and featured a special focus on enhancing their nutritional knowledge.
The gathering was organized by Diana Gregory Outreach Services, a non-profit dedicated to enriching lives through healthy eating. Over the years, this organization has worked tirelessly to provide access to fresh produce and nutritional education for low-income seniors, veterans, and vulnerable individuals in the community.
A Flavorful Presentation
The afternoon began with a lively presentation titled Food, Fun, and Fitness, led by certified nutritionist Debbie Polisky. The interactive session engaged residents in discussions about the benefits of balanced nutrition and simple ways to incorporate healthy foods into their diets. Attendees were eager to learn and ask questions, creating a vibrant atmosphere filled with enthusiasm for healthier living.
As a delightful conclusion to the presentation, each of the 100 seniors in attendance received a pre-packed bag of fresh produce from Fry’s Food Stores, complete with recipes and nutritional information. Watching the smiles on the seniors’ faces as they received these gifts was a heartwarming reminder of the impact of community support.
Generous Support from Fry’s Food Stores
At the outset of the event, Diana Gregory was presented with a generous check from Fry’s Food Stores. This contribution is vital for supporting Diana Gregory Outreach Services and its initiatives. Gregory proudly stated, “We have been serving the town for 16 years, and last year alone, we served over 30,000 seniors and veterans. This kind of support is critical to continue our mission.”
Pam Giannonatti, the Corporate Affairs Manager for Fry’s, emphasized their commitment to fighting food insecurity. With initiatives like “Zero Hunger, Zero Waste,” Fry’s aims to provide fresh food not only in their stores but also to those in need within the community. “Last year alone, we were able to provide over 16 million meals to hungry Arizonans,” Girardi remarked, highlighting the company’s dedication to wholesome nutrition and community welfare.
The Mission of Diana Gregory Outreach Services
Diana Gregory Outreach Services has a clear and impactful mission: to enrich lives through healthy eating. By addressing health disparities and championing holistic nutrition and fitness, the organization ensures that vulnerable populations have access to the resources they need to thrive. Their commitment is straightforward but profound: “We have a responsibility to ensure no veteran, senior, and their families in our community go to bed hungry.”
The culmination of the event was not just about handing out fresh produce; it symbolized a community rallying together to support its most vulnerable members. Flyers were distributed to the residents of Tanner Terrace, spreading awareness about future initiatives and encouraging participation in further programs designed to enhance healthy living.
A Community Commitment
As I observed this event, it became clear that initiatives like these serve a dual purpose: they enrich the lives of seniors by providing them with crucial resources and foster a sense of community among participants. For many seniors, events like these also offer an opportunity to socialize and engage with their neighbors, enhancing their overall well-being.
As National Nutrition Month concludes, the event at Tanner Terrace stands as a shining example of how community partnerships—between organizations, businesses, and residents—can work in harmony to create a healthier future for all. By continuing to support initiatives that prioritize nutrition, we can make a lasting impact on our community’s health and wellness.
In the spirit of National Nutrition Month, let us carry forward the lessons learned and the connections made, ensuring that every member of our community has access to the nourishment they need to lead fulfilling lives.
Related link:
The Bridge is a section of the STM Daily News Blog meant for diversity, offering real news stories about bona fide community efforts to perpetuate a greater good. The purpose of The Bridge is to connect the divides that separate us, fostering understanding and empathy among different groups. By highlighting positive initiatives and inspirational actions, The Bridge aims to create a sense of unity and shared purpose. This section brings to light stories of individuals and organizations working tirelessly to promote inclusivity, equality, and mutual respect. Through these narratives, readers are encouraged to appreciate the richness of diverse perspectives and to participate actively in building stronger, more cohesive communities.
https://stmdailynews.com/the-bridge
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Consumer Corner
Identifying brands as Black-owned can pay off for businesses Draft
A study reveals that labeling restaurants as Black-owned boosts sales and traffic, particularly in liberal areas, highlighting the potential of visibility for minority-owned businesses.
Oren Reshef, Washington University in St. Louis; Abhay Aneja, University of California, Berkeley, and Michael Luca, Johns Hopkins University

Labeling businesses as Black-owned can significantly boost their sales, we found in a recent study.
In June 2020, the business-review website Yelp introduced a feature allowing consumers to search for Black-owned restaurants. As professors who study digitization, inequality and the economics of technology, we were interested in understanding its effect. So we analyzed more than two years of data from Yelp.
We found that restaurants labeled as Black-owned saw a 65% increase in online traffic, more searches and calls, and higher sales through food orders and in-person visits. These results suggest that for many Black-owned businesses, a simple change in their visibility can create new opportunities for growth.
However, the impact varied by location. The gains were strongest in politically liberal areas and places with lower levels of implicit racial bias, as measured by regional variation in implicit-association test scores. This suggests that platforms are in part channeling, as opposed to creating, customer demand. Interestingly, white customers drove most of the increase, suggesting the label helped raise awareness of businesses they might not have considered before.
This wasn’t just a 2020 trend – in follow-up analyses, we found similar results among businesses that opted into the feature later. We also collaborated with the online furniture company Wayfair, which launched a “Black Maker” label on its site in 2023, and found that it led to a 57% increase in web traffic. Finally, Yelp rolled out a Latino-owned label on the platform late that year, which led to a similar increase in consumer engagement.
Why it matters
This research has implications for business owners, digital platforms and policymakers. Growing awareness of racial inequality – partially driven by the Black Lives Matter movement, especially after the murder of George Floyd in 2020 — has led to increased corporate and customer interest in supporting minority-owned businesses. It also led many companies to make commitments to promote racial equity.
However, more recently, many companies have dismantled these efforts. For instance, Target recently announced that it was eliminating its program to spotlight Black-owned businesses. Our findings suggest that increasing the visibility of minority ownership – a relatively low-cost change – can substantially improve economic outcomes for Black-owned businesses.
Our results also show that diversity initiatives aren’t just about warm and fuzzy feelings. Businesses should measure and evaluate their impact to ensure their programs are effective. A well-designed program can benefit the bottom line, while a poorly designed one risks being ineffective or even counterproductive.
So it’s important to acknowledge the potential risks. Past research, including some of our own, indicates that revealing racial identity sometimes can lead to discrimination or backlash. While our findings suggest that labeling can have positive effects, a poorly implemented policy can backfire. Yelp’s initiative design empowered users looking to support Black-owned businesses while allowing other users to continue searching in alternative ways.
That means policy design is crucial. What matters isn’t just what information is revealed, but also how it’s communicated. Our analysis shows that customer demand and preferences vary considerably across locations and demographics, meaning that context also matters.
What still isn’t known
While our research suggests that businesses experienced economic benefits from adopting the label, it’s crucial to understand which policy designs work best in the long run. For instance, Yelp’s program used an opt-in feature, which may have contributed to its success.
However, open questions remain. How are platforms affected by labeling businesses? What other types of labels might be impactful, and for which types of businesses? Could some interventions backfire?
Another key question is, which customers respond to racial identity disclosures? Recent advances in data analytics can help companies refine their strategies, making it easier to target the right consumer groups for more effective initiatives.
Ultimately, our study is a step toward understanding how transparency and visibility can shape economic outcomes. It highlights a diversity initiative that has benefited both customers and businesses, and provides a road map for companies that want to design initiatives that matter. And, more broadly, it speaks to a question facing all companies: How can companies better understand and shape their societal footprint?
The Research Brief is a short take about interesting academic work.
Oren Reshef, Assistant Professor of Strategy and Entrepreneurship, Washington University in St. Louis; Abhay Aneja, Assistant Professor of Law, University of California, Berkeley, and Michael Luca, Director, Technology and Society Initiative, Carey Business School, Johns Hopkins University
This article is republished from The Conversation under a Creative Commons license. Read the original article.
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