Vitamin D deficiency

Vitamin D deficiency is often described as a silent epidemic, affecting approximately 1 billion people worldwide. Data suggest that around 70% of Americans and 72.03% of the Greek population live with insufficient vitamin D levels. In Greece specifically, the most recent available data (2018) indicate that 72.03% of the population has inadequate vitamin D levels, while 17.55% present with significant deficiency.

According to the same study, as well as updated guidelines from the European Food Safety Authority (EFSA, 2023), sufficient vitamin D status is defined by serum 25(OH)D levels above 30 ng/mL. Levels below 30 ng/mL indicate insufficiency, while levels below 12 ng/mL reflect severe deficiency. Women appear to be more prone to deficiency compared to men. EFSA also notes that, within European populations, exceeding the upper safe intake levels of vitamin D is unlikely unless high-dose supplementation is used consistently.

Vitamin D deficiency symptoms

Vitamin D deficiency is not always immediately apparent, yet it can significantly affect quality of life over time. Its symptoms are often non-specific and may be attributed to other causes. Age and specific conditions, such as perimenopause and menopause in women, may enhance these symptoms:

• persistent inflammation,
• hair loss,
• reduced appetite,
• fatigue,
• joint and musculoskeletal pain,
• low mood or depression,
• mood fluctuations,
• muscle cramps, spasms, tremors,
• reduced mobility, and
• increased susceptibility to infections.

Chronically low and not optimal vitamin D levels have been associated with an increased risk of obesity, certain cancers, hypertension, depression, chronic musculoskeletal pain, reduced bone density, and various autoimmune conditions.

Vitamin D role

Vitamin D plays a critical role in regulating calcium and phosphorus absorption, contributing to bone health and mineralization. Equally important is its role in supporting normal immune system function. Adequate vitamin D levels are essential for proper skeletal development, maintenance of bone density, and overall physiological balance.

The amount of vitamin D required varies between individuals and is influenced by genetic predisposition, dietary habits, and overall lifestyle. Factors such as:

• living in areas with high pollution,
• regular sunscreen use,
• limited sun exposure, and
• spending extended periods indoors or in environments that block sunlight can significantly affect the body’s ability to synthesize this essential “sunshine vitamin.”

How can I increase vitamin D in my body?

Increasing vitamin D levels is not an immediate process. It typically requires consistent intervention over several months or longer to achieve and maintain optimal levels. Individual needs vary depending on genetic sensitivity, body composition, and overall health status. A targeted approach, guided by a qualified healthcare professional, is essential.

Some strategies to improve vitamin D levels include:

Optimized nutrition by increasing the intake of foods naturally rich in vitamin D, such as fatty fish (especially small oily fish), salmon, eggs, mushrooms, high-quality fish oils, and beef liver.

Through lifestyle, by increasing daily exposure to sunlight. Approximately 10 minutes of sun exposure per day, with a portion of the skin (such as the arms) uncovered and without sunscreen, can support endogenous vitamin D synthesis.

Through high-quality supplementation, using targeted, high-quality vitamin D supplements. Absorption is optimized when combined with magnesium, vitamin K2, and dietary fat. In cases of severe deficiency, high-dose pharmaceutical vitamin D may be required under medical supervision, followed by maintenance through supplementation.

If you seek a personalized approach to optimizing your vitamin D levels, you can schedule an online consultation to determine the most appropriate strategy and supplementation based on your individual needs.