Summer Sunshine: Nature’s Way of Preparing Your Body for Winter

Did You Know Your Body Naturally Prepares for Winter Every Summer?

Summer offers far more than warm weather and outdoor adventures. It allows our bodies to naturally produce one of the most important nutrients for overall health: vitamin D.

What many people do not realize is that the human body has evolved an incredible ability to prepare for changing seasons. When your skin is exposed to sufficient sunlight, it produces vitamin D, and your body does not simply use it immediately. A portion is stored in body fat and skeletal muscle, creating a natural reserve that can help support your vitamin D status long after summer has ended.

How Has the Human Body Adapted to the Seasons?

Humans have lived through changing seasons for thousands of years. One remarkable adaptation is the body’s ability to build vitamin D reserves during periods of abundant sunshine.

Research suggests that vitamin D metabolites are stored in body fat and skeletal muscle, where they can be gradually released into the bloodstream over time. This helps explain why vitamin D levels often remain adequate for weeks or even months after summer ends.

Our ancestors relied on this remarkable biological adaptation long before supplements existed. The human body learned to make the most of abundant summer sunshine to help carry us through the darker months.

How Much Sunshine Do You Really Need?

Your body produces most of its vitamin D when your skin is exposed to sunlight, but the amount of sun needed varies considerably from person to person. Skin pigmentation, age, season, latitude, time of day, cloud cover, and the amount of skin exposed all influence how much vitamin D your body can produce.

During the summer, fair-skinned individuals may produce sufficient vitamin D with as little as 8 to 10 minutes of midday sun exposure, while people with darker skin generally require longer exposure because melanin naturally absorbs some of the UVB rays needed for vitamin D production. During the Canadian winter, however, the sun is simply not high enough in the sky for meaningful vitamin D production, regardless of skin tone.

Once produced, vitamin D is stored primarily in body fat and skeletal muscle, creating a natural reservoir that helps maintain vitamin D status during periods of limited sun exposure.

Interestingly, research has shown that people with obesity often have greater total vitamin D stores because they have more body fat available to store it. However, these larger fat stores require more vitamin D to become saturated, meaning that proportionally less vitamin D may remain circulating in the bloodstream. This helps explain why obesity is frequently associated with lower blood vitamin D levels despite larger overall vitamin D reserves.

These remarkable adaptations remind us that the body is designed to work with the changing seasons, making the most of abundant summer sunshine to help sustain us through the months when sunlight becomes scarce.

What Can We Learn from the History of Vitamin D?

More than 100 years ago, physicians discovered that cod liver oil could prevent and treat rickets, a disease caused by severe vitamin D deficiency. In the early 1920s, scientists identified vitamin D as the protective nutrient responsible for these effects.

Soon afterward, Nobel Prize-winning chemist Adolf Windaus and other researchers unraveled the chemistry of vitamin D, paving the way for its production on an industrial scale. Today, most vitamin D3 supplements are manufactured by exposing lanolin, a natural wax obtained from sheep’s wool, to ultraviolet light, producing vitamin D3 that is then purified for use in supplements and pharmaceutical products.

For those following a plant-based lifestyle, vegan vitamin D3, derived from lichen, is also available.

While these products have an important role for many individuals, it is fascinating to remember that nature provided humanity with sunlight as the original source long before laboratories learned to reproduce it.

How Can You Enjoy Summer While Supporting Healthy Vitamin D Levels?

Summer is the perfect season to enjoy healthy outdoor activities while naturally supporting vitamin D production.

Take advantage of opportunities to:

• Walk in nature
• Garden
• Play sports with family and friends
• Ride your bicycle
• Swim
• Hike
• Enjoy meals outdoors

The goal is not to get sunburned but to enjoy the sun safely and responsibly.

Why Is Vitamin D So Important?

Vitamin D contributes to many essential functions throughout the body, including:

• Supporting normal immune function
• Maintaining healthy bones and teeth
• Supporting healthy muscle function
• Helping the body absorb calcium and phosphorus

Maintaining healthy vitamin D levels is an important part of overall wellness.

What Nutrients Help Your Body Use Vitamin D?

Producing vitamin D from sunshine is only part of the story. Your body also needs other nutrients to properly activate, absorb, and utilize it.

Magnesium

Magnesium helps activate vitamin D into the forms your body can use. Excellent whole-food sources include moringa leaves, pumpkin seeds, almonds, spinach, Swiss chard, lentils, black beans, and avocados.

Vitamin K2

Vitamin K2 works alongside vitamin D by helping direct calcium to your bones and teeth. Natural food sources include natto (fermented soybeans), aged cheeses, egg yolks, grass-fed butter, and beef liver.

Healthy Fats

Since vitamin D is fat-soluble, healthy fats improve its absorption. Include foods such as avocados, extra virgin olive oil, nuts, seeds, and fatty fish as part of a balanced diet.

What Does This Look Like on Your Plate?

Omnivore meal: Wild salmon, sautéed spinach, avocado, pumpkin seeds, and a side of aged cheese or an egg provide a natural combination of vitamin D, magnesium, vitamin K2, and healthy fats.

Vegan meal: A large salad with leafy greens, avocado, pumpkin seeds, almonds, olive oil dressing, lentils or beans, and a serving of natto provides magnesium, vitamin K2, healthy fats, and a variety of nutrients that work together to support overall health.

Nature rarely delivers nutrients one at a time. Whole foods provide vitamins, minerals, healthy fats, antioxidants, and plant compounds that work together in harmony to nourish the body.

What Does This Mean for Canadians?

Living in Canada has many advantages, but our northern latitude also means that during much of the winter, the sun is simply not high enough in the sky for our skin to produce meaningful amounts of vitamin D.

The vitamin D your body naturally builds during the brighter months can help support your levels for a period of time, but these reserves gradually decline throughout the winter. How long they last varies from person to person and depends on factors such as summer sun exposure, body composition, age, skin pigmentation, diet, and overall health.

When sunshine and diet are not enough, healthcare professionals may recommend vitamin D supplementation. Whether choosing conventional vitamin D3 or vegan vitamin D3 derived from lichen, supplements should complement—not replace—a healthy lifestyle built on nutritious food and regular outdoor activity.

At Nia Pure Nature and Piur1, we believe that whole foods should always come first. Nutrient-dense foods such as our organic freeze-dried moringa naturally provide magnesium along with a broad spectrum of vitamins, minerals, antioxidants, and phytonutrients that complement a balanced diet and active lifestyle.

Can Nature Still Teach Us Something?

Rather than fearing the sun, we can appreciate it as one of nature’s remarkable gifts when enjoyed safely and in moderation.

This summer, spend time outside. Walk through the forest. Swim in a lake. Garden. Play with your children or grandchildren. Hike, cycle, or simply enjoy your morning coffee on the patio.

Your body has spent thousands of years evolving to work with nature. Sometimes the most remarkable health strategies are not new discoveries but ancient biological adaptations that continue to serve us today.