3. Bone and back pain
Vitamin D helps to maintain bone health in various ways. First, it improves the absorption of calcium in the body. Bone pain and lower back pain may be signs of insufficient vitamin D levels in the blood. Large studies have found a link between vitamin D deficiency and chronic (low) back pain among 9,000 women. The researchers discovered that people with a deficiency were more likely to have back pain, including severe back pain that limited their daily activities. Leg, rib or joint pain is also more common among people with a vitamin D deficiency.
Some people sometimes say that they have a winter depression, because they get sad of the cold and the rain. But a depressed mood can also be a sign of vitamin D deficiency. In overview studies, researchers have linked vitamin D deficiency to depression, especially among older adults. This was because 65% of the depressed elderly appeared to have low blood levels and a vitamin D deficiency. Some controlled studies have shown that giving vitamin D to people with a deficiency helps improve depression.
5. Slow wound healing
Slow healing of wounds after surgery or injury can be a sign that the vitamin D levels are too low. Results of a study suggest that the vitamin boosts the production of substances that are crucial to the formation of new skin as part of the wound healing process. However, the study found that when vitamin D supplements were administered to patients with leg ulcers, ulcer size decreased on average by 28%. Curious about the last two symptoms? You can read it on the next page.