Vitamin D: How to Get Enough Once Fall Begins

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Getting enough vitamin D—which is responsible for boosting our immunity and aiding with calcium absorption—is really important.

In many parts of the U.S., sunlight exposure is (in theory) at its highest between April and September, meaning we can absorb vitamin D naturally from the sun’s rays. It’s worth noting, however, that vitamin D deficiency is common in the U.S., affecting 35% of adults (and half of of the population worldwide).

As summer comes to an end, we’ll experience even less sunlight, so ensuring you have adequate vitamin D levels is even more important. Nutritional therapist Farzanah Nasser breaks down the signs of vitamin D deficiency, and recommends accessible foods that are rich in vitamin D.

What is vitamin D?

Vitamin D helps to regulate calcium and phosphate levels in the body, which affect our bones and muscles. Whilst often thought of as a mineral, it is a hormone that we primarily synthesize from the sun.

How does vitamin D function in the body?

Vitamin D is absorbed through the skin via receptor cells and then stored within the body, where it can remain inactive until needed. The liver and kidneys then convert stowed away vitamin D into the active form that the body requires when necessary.

In severe cases, long-term vitamin D deficiencies can cause rickets in children and osteoporosis in adults.

Nasser says that “maintaining a good level of vitamin D during the autumn can help prevent colds and flus. Studies have shown that high levels of colds and flu in the UK occur during the winter and there might be a correlation between us having the lowest levels of vitamin D as well.” To boost vitamin D levels in these cooler months “try to get around 15-20 minutes of sunlight on your skin between 9am in the morning and 3pm in the afternoon, then apply SPF immediately after.” Nasser adds – which has also been recommended by Columbia University Irving Medical Center. This should not be practiced without wearing a broad-spectrum SPF during the summer, when sun exposure is at it’s highest.

How do I know if I am vitamin D deficient?

First and foremost, talk to your healthcare provider if you are concerned about whether you’re getting enough vitamin D. Signs of a vitamin D deficiency can include: fatigue, weak nails, hair loss, and constantly getting ill.

“General practitioners can not only test your vitamin D levels but can help you draw together a supplement plan. I recommend getting this done at the end of September, so you can gauge how well your body was able to absorb vitamin D over the summer,” Nasser explains.

Which foods are rich in vitamin D?

Oily fish is a great source of vitamin D (and protein, too). “You can think of the acronym SMASH to help you: salmon, mackerel, anchovies, sardines and herring,” says Nasser. Egg yolks and red meat are good sources too, as well as vitamin D fortified breakfast cereals.

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