We get most of our vitamin D from sunlight on our skin. The vitamin is made by our body under the skin, in reaction to summer sunlight.
The NHS says Vitamin D has several important functions. For example, it helps to regulate the amount of calcium and phosphate in the body. These nutrients are needed to keep bones and teeth healthy, particularly for women over the age of 50.
A lack of vitamin D can lead to bone deformities such as rickets in children, and bone pain and tenderness as a result of a condition called osteomalacia in adults.
Depending on where you live, however, Vitamin D is not easy to get.
Add more fish to your diet
First on the list is to add supplements. There are a lot of brands on the market and it is advised that you should consult your GP to make sure you are getting the right one for you.
Next, add more fish to your diet. Vitamin D is found in a small number of foods. Good food sources are oily fish such as salmon, sardines and mackerel.
Finally, try and get some summer sun if you can! There is no consensus about how much you need, but it's recommended that you get 15-20 minutes early in the morning. Though, of course, it's important to still wear UV protection.