Vitamin D is crucial to the body, because it helps to keep your bones, teeth and muscles healthy, said the NHS.
If you don’t get enough vitamin D in your diet, the body struggles to regulate calcium and phosphate.
But a severe lack of vitamin D may even lead to some serious complications, including rickets, bone deformities, or osteomalacia.
Vitamin D is an integral part of the immune system, so the symptoms of a deficiency often surround a general feeling of weakness.
Fatigue are malaise are often the very first symptoms of a vitamin D deficiency, said nutritionist Dr Steven Lin.
The condition could also lead to getting sick more often, as well as having wounds that take longer to heal.
You should speak to a doctor if you develop any symptoms of a vitamin D deficiency, he warned.
“Vitamin D deficiency is the most common and easiest indicator of your health you need to be familiar with,” said the nutritionist on his website.
“I often see people who think they eat healthy and exercise regularly, and all their hard work is easily be undermined by low vitamin D levels.
“Because vitamin D is such an integral part of your immune system health, some of the first symptoms of low vitamin D levels are overall malaise and getting sick easily.
“I recommend making an appoint with your doctor to test your vitamin D levels if you have any of the symptoms or risk factors.
“Vitamin D deficiency is so prevalent and significant to your health, it’s important to know you’re getting a sufficient amount.”
Other warning signs of a vitamin D deficiency include chronic pain, hair loss, and having bones that break easily.
Most people should be able to get enough vitamin D in their diet. One of the best sources of vitamin D is oily fish, including salmon, sardines and mackerel.
Other dietary sources include Portobello mushroom, fortified cereals, dairy products, and eggs.
During the autumn and winter months, people struggle to get enough vitamin D from the sun due to reduced daylight hours and the angle of the Earth.
It’s therefore recommended that everyone takes a vitamin D supplement every day, said the NHS.
A 10mcg supplement of vitamin D should be enough for most people over five years old.
Those most at risk of the condition are people that don’t spend much time outdoors, or people that live in an institution, like a care home.
People with dark skin from African, African-Caribbean, or south Asian backgrounds may also be at risk of a vitamin D deficiency.
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