As the colder months approach, we’ve all heard the saying, “It’s not the cold that makes you sick, it’s the germs.” While this is partially true, there are a few reasons why we’re more susceptible to catching colds and the flu during winter.

1. Reduced Vitamin D: During the winter, we spend less time outdoors, which means less exposure to sunlight. Sunlight is essential for the production of vitamin D, a nutrient that plays a critical role in immune function. When vitamin D levels are low, our bodies become more vulnerable to infections.

2. Crowded Indoor Spaces: As we huddle indoors to stay warm, we’re more likely to come into contact with viruses and bacteria spread by other people. This is especially true in places like schools, offices, and public transportation.

3. Dryer Air: The air in our homes and workplaces tends to be drier in winter due to heating systems. Dry air can irritate our nasal passages and make it easier for viruses to enter our bodies.

4. Reduced Immune Response: Cold temperatures can actually suppress our immune system, making it harder to fight off infections. This is because our blood vessels constrict to conserve heat, which can reduce the flow of oxygen and nutrients to our immune cells.

5. Stress: The stress of the holiday season can also weaken our immune system, making us more susceptible to illness.

To stay healthy during the winter, it’s important to:

Get plenty of sleep
Eat a healthy diet
Wash your hands frequently
Avoid touching your face
Stay home when you’re sick

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