1 / 6Vitamin D is essential for making your immune system strong. Studies have previously shown that vitamin D may help protect against respiratory infections. Vitamin D works with the cells in your body that fight infection and can help if you have frequent colds.2 / 6Vitamin D plays an important role in the way that calcium is absorbed into the system. If your bones lose calcium and other minerals, you will be more susceptible to bone fractures and breaks. 3 / 6Previous studies have shown that you can always feel tired due to a lack of blood in the body. Earlier research by experts at the University of Newcastle found that vitamin D has been proven to boost energy levels. 4 / 6Vitamin D deficiency has been linked to depression in adults. Researchers analyzed the role of vitamin D on people in their older years and found that 65 percent of those who showed symptoms of depression also had low levels of the vitamin.5 / 6Your wounds and cuts may take longer to heal if you are deficient in vitamin D. Vitamin D plays a role in controlling inflammation and fighting infection, both of which are essential for adequate healing.6 / 6You must take sunlight to make up for the deficiency of Vitamin D. Apart from this, include things like salmon fish, mushrooms, tuna fish, meat, eggs, salami, milk, orange juice, soybeans, shrimp (seafood) and vanilla yogurt in your diet.