Let the Sunshine In

As a clinical social worker, I have observed firsthand the effects that vitamin D levels can have on mood.  The shorter days of Winter are tough on many people. Vitamin D- which our bodies make when exposed to the sun, is crucial for making hundreds of enzymes and protein and interacting with more than 2,000 genes vital for health and fighting disease- is in limited supply.  Vitamin D deficiency has been linked to chronic modern diseases such as heart disease, diabetes, cancer, osteoporosis, and depression. 

Several studies suggests that Vitamin D deficiency and depression are linked, and that increasing Vitamin D levels can help. We do not know whether low levels of vitamin D cause depression, worsen it, or are a symptom of the underlying depression. One study included  adult women with depression, all of whom were taking antidepressants. The women were also being treated for Type 2 Diabetes or an underactive thyroid gland. All were deficient in vitamin D, with levels under 21 ng/mL. Levels below 21 ng/mL are considered vitamin D deficient.  The women received vitamin D therapy for eight to 12 weeks. After treatment, their levels increased to 32 to 38 ng/mL. The women also reported improvements in symptoms of depression following vitamin D therapy. One woman's depression score changed from indicating a major depression to mild depression.  

I believe that many doctors and mental health professionals have had similar experiences with patients. I have had three clients who presented with major depression, tested below 10ng/ml in vitamin D, and after 10 weeks of receiving vitamin D supplements and weekly therapy, experienced a remission in their depression. Of course we can't measure how much improvement was caused by the increase in Vitamin D, and how much was caused by therapy.  My stance regarding treatment is to  use every helpful, healthy tool available to combat depression.

In addition to the clients who have suffered from major depression and had their Vitamin D levels tested, I have had many clients who have described and exhibited increased symptoms of depression in the late Fall and Winter. Seasonal Affective Disorder (SAD) is real, can be debilitating, and is prevalent when vitamin D stores are low.  In one study, eight subjects with SAD received 100,000 I.U. of vitamin D daily and all experienced a significant lessening of their depression as measured by the Hamilton Depression Inventory. Vitamin D blood levels improved by 74% in all eight subjects.  Vitamin D may be an important treatment for SAD. More, larger studies will be necessary to confirm these findings.

Vitamin D is called the sunshine vitamin because our bodies produce it when exposed to sunlight. Sunlight is an excellent source of vitamin D.  A person sitting outside in a bathing suit in New York City gets more vitamin D in 20 minutes than from drinking 200 glasses of milk.  Many experts suggest getting 10 to 15 minutes of sunshine sans sunscreen three times weekly.  Talk to your doctor about the pros and cons of sun exposure for you. 

Vitamin D is also added to milk and other foods, and is available in small amounts in fatty fish like tuna, salmon, and mackerel; beef liver, cheese, and egg yolks. It can be hard to get as much as we need from our diets, which is why supplements are often needed. Many, but not all, doctors include Vitamin D levels in their standard battery of blood tests when patients come in for a physical. Make sure you check with your doc if you are depressed, and request a blood test for Vitamin D levels. Your health depends on it.