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Vitamin D is essential for health. It aids in the absorption of calcium, supports bone development, and strengthens the immune system. Often referred to as the 'sunshine vitamin,' it is synthesized in the body through sunlight exposure, technically making it a prohormone. With the pandemic drastically reducing outdoor activities, many are concerned about their vitamin D levels and whether they need to take additional measures to maintain them.
A significant portion of Americans lack sufficient vitamin D
Vitamin D deficiency is widespread, with approximately 42% of Americans falling below the recommended levels. Modern lifestyles involve far less sun exposure compared to previous generations.
There are several ways to ensure you get enough vitamin D, including increasing the amount of sunlight you get; eating foods that naturally contain vitamin D, such as fatty fishes; and eating fortified foods or taking a vitamin D supplement.
Vitamin D is something your body will store for later use, which means you don’t need to get enough of it every single day—you just need to get enough to last you over a period of time.
What is the Recommended Daily Intake of Vitamin D?
How much vitamin D you need depends on a number of factors, including your age, race, amount of regular sun exposure and the season. The average most people need ranges between 10-20 micrograms. Since vitamin D can be safely stored in the body, blood levels are deemed to be sufficient.
The more melanin your skin has, the more sunlight you require to make vitamin D. If you don’t get a lot of sun exposure, or if you live in a northern part of the country, you’ll also probably need to take in more vitamin D from other sources, which could come in the form of vitamins or fortified foods.
Which foods are rich in vitamin D?
Vitamin D can be found in various foods such as fatty fish like tuna, mackerel, and salmon, as well as beef liver, cheese, and egg yolks. Additionally, many foods are fortified with vitamin D, including certain dairy products, orange juice, soy milk, and cereals. It's important to check the nutritional labels on these products, as not all brands include added vitamin D.
While milk is often considered a good source of vitamin D, it only contains this nutrient if it has been fortified. This information is typically indicated on the product label.
What is the ideal amount of sunlight exposure for vitamin D production?
Midday sunlight is the most effective for vitamin D synthesis. Generally, 10-15 minutes of sun exposure a few times a week is sufficient for the body to produce the necessary amount of vitamin D. However, this can vary based on factors such as the time of year, geographic location, cloud cover, and more. Direct sunlight, rather than early morning or late afternoon sun, is required, which can be challenging to obtain during winter.
Individuals residing above the 37th parallel north—such as those in Richmond, Virginia; Denver, Colorado; St. Louis; and more northern regions—can only obtain sufficient direct sunlight during the summer, increasing their risk of vitamin D deficiency.
If this applies to you and sunlight alone isn't enough, consider evaluating your diet to determine if you need to incorporate additional vitamin D sources, as mentioned earlier. Fortunately, there are multiple options available, and the best choice depends on your specific circumstances.
