By Dr. Karina Angiletta, PhD, FNP-C | Full Spectrum Health & Wellness
Feeling more tired than usual? Noticing muscle aches or struggling with low energy as the days get shorter?
It is easy to blame the season or a busy schedule. Sometimes, vitamin D deficiency is part of the picture.
Low vitamin D is something I see regularly in my practice. As we head into winter in Idaho and Washington, I want more patients to understand why this nutrient matters—and why I believe checking it belongs in routine lab work.
Why vitamin D matters
Often called the “sunshine vitamin,” vitamin D helps your body absorb calcium and maintain healthy bones. It also supports muscle function and normal immune function.
Deficiency can develop without obvious symptoms. You do not have to feel unwell for a low result to deserve attention.
Why winter makes vitamin D a concern
Your skin makes vitamin D when exposed to ultraviolet B sunlight. During winter at northern latitudes, the sun’s angle makes this process less reliable. Spending more time indoors and covering up against the cold further limits exposure.
Here in North Idaho and Eastern Washington, enjoying the outdoors does not necessarily mean your body is producing enough vitamin D through the winter.
Other factors can affect your levels, including age, skin pigmentation, conditions that interfere with nutrient absorption, and certain medications.
Signs and symptoms worth discussing
Fatigue and low energy
If you feel drained despite getting rest, vitamin D may be worth a closer look. Research has found that correcting deficiency can improve fatigue in some people.
Ongoing tiredness deserves a thoughtful assessment that also considers sleep, nutrition, thyroid function, and other possible contributors.
Muscle weakness or bone discomfort
Vitamin D supports the way your body uses calcium and maintains bone tissue. Significant deficiency can contribute to muscle weakness and bone pain.
Persistent discomfort or a change in your strength is worth discussing with your clinician, especially if it is affecting daily activities.
Changes in mood
Research has found associations between low vitamin D and depressive symptoms. Mood changes deserve a broader assessment, including sleep, stress, mental health, and hormonal changes when relevant.
Checking vitamin D can be part of that conversation, while persistent low mood also deserves appropriate mental health care.
Why I recommend checking vitamin D routinely
Because vitamin D is important to bone and muscle health—and because I frequently see low levels in practice—I recommend including it in routine laboratory assessment.
In my approach to care, nutritional health deserves attention alongside hormones, thyroid function, and metabolic health.
A blood test helps us understand your vitamin D status and build an individualized plan. If your level is low, we can review possible contributors, recommend appropriate supplementation, and follow your response over time.
How to support your vitamin D levels
Foods such as salmon, egg yolks, and vitamin D-fortified milk or plant beverages can contribute to your intake. Supplements may be needed to correct a deficiency or maintain adequate levels.
The right approach depends on your lab results, medical history, absorption, and current supplements. Taking vitamin D with a meal containing some fat can improve absorption. Your dose and follow-up should be individualized, since excessive supplementation can be harmful.
The goal is a consistent plan that supports your health through winter and beyond.
Personalized care in Idaho and Washington
At Full Spectrum Health & Wellness, I work directly with patients to understand their symptoms, interpret relevant lab findings, and develop a personalized care plan.
Nutritional health is considered alongside thyroid care, perimenopause and menopause care, and metabolic health when appropriate.
Telemedicine appointments are available throughout Idaho and Washington, including Coeur d’Alene, Rathdrum, Spokane, and surrounding communities.
If you have been feeling run down or want a more thoughtful look at your health, book a free introductory consultation.
