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  • Writer's pictureLisa Smith

10 Signs of Low Vitamin D

Updated: Jun 4

woman sunbathing

10 Signs of Low Vitamin D According to The Experts

In this blog post, we're shining a light on a nutrient that holds a special place in our well-being – vitamin D. Fondly referred to as the "sunshine vitamin," it's not just about lifting our spirits; it plays a pivotal role in our bones, immunity, and overall vitality. Here are 10 subtle signals that might be your body's way of asking for a vitamin D boost.

Vitamin D is Potent!

Vitamin D isn't your average nutrient; it's a potent hormone synthesised in response to sun exposure. Unlike its counterparts that often come from our diet, vitamin D takes form in our skin with a little help from sunlight. Its primary duty? Regulating calcium and phosphorus levels, the dynamic duo behind strong bones, efficient muscles, and a resilient immune system.

10 Subtle Clues of Possible Vitamin D Deficiency:

  1. Mood Problems: Feeling blue? Emerging research draws connections between low vitamin D levels and mood imbalances like depression, anxiety, mood swings, and irritability.

  2. Bone Health: Imagine your bones as delicate sculptures that need a sturdy foundation. Vitamin D deficiency can weaken this foundation, causing low bone density and fractures even from minor stress.

  3. Energy Drain: If you're hitting an energy slump too often, your vitamin D status could be to blame. This nutrient is your body's energy conductor, and insufficient levels might result in prolonged fatigue.

  4. Muscle Mysteries: Has your body ever staged a muscle cramp show without your consent? Vitamin D insufficiency might be at the heart of this performance. Weakness, cramps, and discomfort are common cues.

  5. Joint Aches: Persistent joint discomfort, especially in the back and knees, could point to low vitamin D levels. The vitamin's anti-inflammatory prowess plays a role in maintaining joint health.

  6. Glucose Rollercoaster: Those post-lunch energy crashes can be akin to slamming into a brick wall. Vitamin D influences insulin sensitivity, which impacts blood sugar regulation. Fluctuating energy levels may indicate a deficiency.

  7. Immunity Issues: Your immune system relies on vitamin D like a trusty guardian. Inadequate levels can weaken this defence mechanism, leaving you more susceptible to infections and illnesses.

  8. Wound Healing: If your cuts and scrapes seem to linger in healing mode, vitamin D might be the missing piece. The nutrient aids in wound healing, so low levels could hinder this natural process.

  9. Calcium Levels: Vitamin D and calcium are inseparable partners in bone health. With low vitamin D levels, calcium may not be properly absorbed, leading to brittle bones, osteoporosis and heightened fracture risks.

  10. Weight Management: Unexplained weight gain can be puzzling, but vitamin D might provide a clue. While the exact link is intricate, research hints at the nutrient's influence on appetite regulation, weight gain and fat storage.

Thyroid Health and Vitamin D

Vitamin D plays a crucial role in supporting thyroid function. The thyroid gland, located in the neck, is responsible for regulating various metabolic processes throughout the body. Vitamin D receptors are found in the thyroid, highlighting the importance of this vitamin in thyroid health.

Adequate vitamin D levels help modulate the immune system and can potentially reduce the risk of autoimmune thyroid disorders like Hashimoto's thyroiditis and Graves' disease. Additionally, vitamin D supports the conversion of the inactive thyroid hormone (T4) into the active form (T3), ensuring proper thyroid function. Thus, maintaining optimal vitamin D levels through sun exposure, dietary sources, or supplements can contribute to overall thyroid health and hormonal balance.

Unlocking the Role of Vitamin K2

drawings of bones

The Dynamic Duo: Vitamin D and K2

While Vitamin D is known for its pivotal role in calcium regulation, Vitamin K2 often stands in the background, performing a complementary task. Vitamin K2 is crucial for directing calcium to the right places in the body, primarily the bones and teeth, while preventing it from accumulating in soft tissues and arteries.

Here's why Vitamin K2 matters:

1. Bone Health: Vitamin K2 activates proteins that bind calcium to the bone matrix, ensuring that calcium is deposited where it should be – in the bones.

2. Cardiovascular Health: By preventing calcium from building up in the arteries, Vitamin K2 may support cardiovascular health and reduce the risk of arterial calcification.

3. Dental Health: K2 plays a role in tooth mineralization, promoting strong and healthy teeth.

The Synergy of Vitamin D and K2

What makes these two vitamins a dynamic duo is their synergy. Vitamin D helps the body absorb calcium, while Vitamin K2 directs that calcium to the right places. Without sufficient Vitamin K2, the calcium absorbed due to Vitamin D may not be effectively utilised, potentially leading to calcium buildup in the arteries, which is a risk factor for heart disease.

How to Make Sure You Have Enough Vitamin D

woman in forest

Reap the benefits of Vitamin D and K2 with these simple tips:

1. Sunlight Exposure: Spend time outdoors to allow your skin to synthesise Vitamin D when exposed to sunlight.

2. Dietary Sources: Include foods rich in Vitamin K2, such as fermented foods (e.g., natto, sauerkraut) and certain animal products (e.g., grass-fed dairy, egg yolks).

3. Supplementation: If you have limited sunlight exposure or dietary restrictions, supplements can be a valuable tool to meet your Vitamin D and K2 needs. Always consult a healthcare professional before starting any supplementation regimen.

Vitamin D and K2 may not be the flashiest vitamins, but their roles in maintaining strong bones, a healthy heart, and a robust immune system are invaluable. Understanding how these two vitamins work together can help you make informed choices about your nutrition and overall health.

Vitamin D and Menopause: A Vital Connection

woman reading with cup of tea next to flowers

5 Reasons Why Vitamin D is Essential During Menopause

Menopause is a natural biological transition in a woman's life, marking the end of her reproductive years. This phase is characterised by a decline in oestrogen and progesterone production, which can lead to various physical and hormonal changes. One essential nutrient that becomes increasingly important during menopause is Vitamin D. This nutrient plays a significant role in women's health, especially during menopause.

1. Bone Health: Vitamin D is crucial for maintaining strong and healthy bones. During menopause, the decline in oestrogen levels can accelerate bone loss, potentially leading to osteoporosis. Vitamin D aids in the absorption of calcium, which is necessary for bone mineralization. Insufficient Vitamin D levels can result in weakened bones, making women more susceptible to fractures and osteoporosis.

2. Hormonal Balance: Vitamin D plays a role in hormone regulation. Adequate levels of Vitamin D may help support hormonal balance during menopause. Some studies suggest that Vitamin D may have a role in reducing the severity of menopausal symptoms such as hot flashes and mood swings.

3. Immune System Support: Menopausal women may experience changes in their immune system, making them more susceptible to infections and illnesses. Vitamin D is known to enhance immune function, potentially helping women stay healthy during this transitional phase.

4. Cardiovascular Health: Menopause is associated with an increased risk of heart disease. Vitamin D may contribute to cardiovascular health by helping to regulate blood pressure and reducing inflammation. This can be particularly beneficial for menopausal women who may face a higher risk of heart-related issues.

5. Mood and Cognitive Function: Some research suggests a link between low Vitamin D levels and an increased risk of mood disorders and cognitive decline. Menopausal women are already at risk for mood swings and memory issues, so maintaining adequate Vitamin D levels could potentially offer some cognitive and emotional support.

It's essential for women going through menopause to monitor their Vitamin D levels and consider supplementation if needed. However, it's equally important to consult with a healthcare professional to determine the appropriate dosage, as excessive Vitamin D intake can have adverse effects.

What Foods Are High in Vitamin D?

Plate of salmon and vegetables

How to Increase Your Vitamin D

Before rushing into supplements, let's explore food-based vitamin D sources. Fatty fish like salmon and mackerel are stars on this front, packing substantial vitamin D content. Fortified dairy products, orange juice, and cereals also contribute to your intake. Don't forget the egg yolks – they're a pocket of vitamin D goodness.

What are Your Vitamin D Levels?

Test don’t guess! Suspecting a vitamin D deficiency is one thing; confirming it is another. Evidence-based testing is essential. A blood test specifically measuring 25-hydroxyvitamin D (25(OH)D) levels is the gold standard.

Vitamin D and Supplements

When dietary sources and sun exposure fall short, supplements step in. Vitamin D supplements come in two main forms: vitamin D2 (ergocalciferol) and vitamin D3 (cholecalciferol). Of the two, D3 is often preferred, as it's the form synthesised in response to sunlight. Dosage recommendations vary, but common guidelines suggest 600-800 international units (IU) per day for adults. However, individual needs can differ based on factors like age, skin colour, and sun exposure.

The Balance between Sun and Supplements

While supplements are a convenient option, let's not neglect the power of sunshine. Around 10-30 minutes of sun exposure a few times a week on areas like arms, legs, and face can stimulate vitamin D synthesis. However, it's essential to strike a balance – too much sun without proper protection can heighten the risk of skin damage.

Vitamin D, the unassuming sunshine vitamin, wears many hats when it comes to maintaining our health. From shaping our mood to fortifying our bones and bolstering our immunity, it's a backstage hero. Remember, it's not just about taking supplements; it's about crafting a balanced lifestyle that includes nutrient-rich foods, mindful sun exposure, and well-informed quality supplement choices.

Vitamin D is also a vital nutrient for women during menopause. It supports bone health, hormonal balance, immune function, cardiovascular health, and may contribute to mood and cognitive well-being. Maintaining sufficient Vitamin D levels through a combination of sunlight exposure, dietary sources, and supplements when necessary can help women navigate the challenges of menopause with better overall health and well-being.

Online Nutrition Advice in Manchester & Across the UK

Lisa Smith Nutritionist

Let's work together for a healthier, happier future! I am a BANT Registered Nutritionist, I'm passionate about unravelling unique health stories. I love to share insights for manageable nutrition and lifestyle changes. Inspired by the incredible transformations I’ve witnessed in my clients, I’m here to guide you toward a healthier, happier you!

If any of the 10 signs of vitamin D deficiency resonate with you, contact me for a free health review. I help women over 35, from perimenopause to menopause and beyond, lose weight, ease digestive issues and balance hormones for a healthier, happier future.

I offer online nutrition advice for clients in Altrincham, Manchester and across the UK, with vitamin D test, if necessary. Cheshire Nutrition is based in Manchester & online.

DISCLAIMER: The content on this webpage is not intended to be a substitute for professional medical advice, diagnosis, or treatment. Always seek the advice of your doctor or qualified healthcare provider. Never disregard professional medical advice or delay in seeking it because of something you have read on my website.


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2. Aranow C. Vitamin D and the immune system. J Investig Med. 2011;59(6):881-886.

3. Anglin RE, Samaan Z, Walter SD, McDonald SD. Vitamin D deficiency and depression in adults: systematic review and meta-analysis. Br J Psychiatry. 2013;202(2):100-107.

4. Menezes AR, Lamb MC, Lavie CJ, et al. Vitamin D, Insulin Resistance, and Cardiovascular Disease. J Clin Endocrinol Metab. 2018;103(9):3353-3365.


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