5. You are feeling really down
It’s normal to feel down and depressed once in a while; however, if you are noticing that you are feeling noticeably down and very depressed, and it’s been going on for a long period of time, it might just be that you are deficient in vitamin D.
Several research studies have found that a vitamin D deficiency, especially in older adults, can lead to depression.
Why? – Because vitamin D helps to regulate certain chemicals in your brain, including those that impact your mood. If you aren’t getting enough vitamin D, your mood could end up suffering.