VITAMIN D, KNOWN as the sunshine vitamin, is often deficient in our bodies during the darker months. But what about the summer? Can we still be deficient? Understanding the potential risks of vitamin D deficiency, such as weakened bones and increased susceptibility to certain diseases, should be a cause for concern.
Vitamin D is a fat-soluble vitamin produced by the skin with the help of the sun’s UV-B rays. Sufficient production in our region is only possible during sunny times, roughly from March to October. During this time, the body can produce enough to meet its needs and store fat and muscle tissue reserves for winter. However, this is only possible if we spend enough time in the sun without covering our skin.
How Much Vitamin D Do We Need?
There are different forms of vitamin D, the most important being D1, D2, D3, D4, and D5. However, when people talk about vitamin D, they usually mean vitamin D3. It is found in sunlight and food, whereas the others are artificially produced. According to the German Nutrition Society (DGE), teenagers and adults get 2 to 4 µg of vitamin D daily from food, but this is not enough. The body should produce about 20 µg from sunlight.
Is Vitamin D a Useful Supplement in the Summer?
Vitamin D is crucial for bone metabolism, incorporating calcium and phosphate into our bones and pivotal in bone mineralisation. Its role in bone health is paramount and should be understood well.
Despite summer being the ideal time to boost vitamin D levels, many people need more sun. Work commitments, sunscreen, and lack of outdoor time interfere with vitamin D production. Studies show that even in summer, many people must achieve optimal levels.
“Sunscreens are essential for preventing skin cancer, but they also block UV-B rays necessary for vitamin D production,” says Dr Smith. “Even a sun protection factor of 15 can reduce production by around 90%.” Balancing adequate sun protection with sufficient vitamin D production can be challenging.
Certain groups may benefit from vitamin D supplementation even in summer:
- Older people: The skin’s ability to produce vitamin D decreases.
- People with darker skin need more sun exposure to produce the same amount of vitamin D as those with lighter skin.
- People who rarely go outdoors: Individuals who spend much time indoors for work or health reasons are at higher risk of deficiency.
- Babies and young children: They have higher needs and should be protected from direct sunlight due to their sensitive skin.
Should I Take Vitamin D Supplements in the Summer?
While the body can typically produce enough vitamin D in the summer, various factors can prevent this. Taking supplements might be beneficial, especially for high-risk groups. “A blood test at your doctor’s office will determine your vitamin D status and whether supplementation is necessary,” advises Dr Johnson.
Vitamin D deficiency is common, but an overdose can have serious consequences. Overdosing from food or sunlight is unlikely, but it can happen with supplements. An overdose leads to increased calcium levels in the body, causing acute nausea, loss of appetite, vomiting, or abdominal cramps. Severe cases can result in kidney damage, irregular heartbeat, unconsciousness, or even death. Therefore, it’s important to be cautious and consult a healthcare professional before starting any supplementation.
“To prevent supplementation from doing more harm than good, a doctor should always be consulted, and blood tests carried out,” Dr Williams emphasises.
In summary, while summer provides an excellent opportunity to increase vitamin D levels naturally, many people still need to catch up. Factors like sunscreen use, time spent indoors, and skin type all play a role. Supplements may be necessary for those at higher risk of deficiency, but medical advice and monitoring are crucial to avoid potential health risks.
