Vitamin D and Calcium for Women: Needs and Sources

Vitamin D and calcium work together to keep a woman's bones, teeth and muscles strong. You can get vitamin D from sunlight and a few foods, and calcium mainly from milk products, leafy greens and fortified foods. Many women in India are low in vitamin D even though the country is sunny, so it is worth asking your doctor about testing.

This guide explains how much you need, the best food sources, how to use sunlight sensibly, signs of deficiency and when supplements make sense.

Why bones need both

The NHS explains that vitamin D helps the body regulate calcium and phosphate, the minerals that keep bones, teeth and muscles healthy. MedlinePlus adds that most of the body's calcium is stored in bones and teeth, and that calcium also helps muscles move and nerves carry messages. Too little calcium over many years is linked to weak, brittle bones (osteoporosis). Read more in osteoporosis and bone health in women.

Why vitamin D is low in sunny India

A 2014 review in the journal Nutrients found that between 70% and 100% of the general population in India had low vitamin D, using a blood level below 20 ng/mL as the cut-off. Studies differ in method and population, so the exact figure varies. The review gave several reasons:

• Clothing that covers most of the body, so little skin meets sunlight
• Darker skin, which has more melanin that acts as a natural sunscreen
• Indoor work, crowded housing that blocks direct sun and air pollution in cities
• A mostly vegetarian diet, with few vitamin D-rich animal foods
• Milk that is rarely fortified and has very little vitamin D

The review states that Indian skin may need more than 45 minutes of direct sun on the bare face, arms and legs a day. That number comes from a single review, so please do not treat it as a rule. Cleveland Clinic notes that sun is not a reliable source for everyone and that too much sun without protection raises the risk of skin cancer.

How much do you need?

Guidelines vary between countries and over the age of the woman, so use these as examples and ask your doctor.

• Vitamin D (NHS): 10 micrograms (400 IU) a day for adults, including during pregnancy and breastfeeding.
• Calcium (NHS): 700 mg a day for adults aged 19 to 64.
• Calcium (MedlinePlus, US): 1,000 mg a day for ages 19 to 50 and 1,200 mg for women 51 to 70.

The Nutrients review notes that calcium intake in India is often below the ICMR recommended amount, partly because phytates in some grains reduce absorption and many people cannot digest milk well. Ask your doctor or a dietitian which target applies to you.

Food sources

Calcium

• Milk, curd (yogurt), paneer and cheese
• Green leafy vegetables such as okra and kale. The NHS says spinach is high in calcium but the body absorbs only part of it
• Fish eaten with the small bones, such as sardines
• Calcium-fortified soya drinks or fortified flour products

Vitamin D

• Oily fish such as sardines and mackerel
• Egg yolks and some red meat
• Fortified foods such as some cereals and spreads
• The NHS advises pregnant women to avoid liver

Few foods contain much vitamin D, which is why sunlight and sometimes supplements matter. For balanced meals see 10 healthy lifestyle habits every woman should follow.

Tip: Combine a short walk outdoors with the time you already go out, such as a morning or evening errand, and let your forearms and face meet daylight when it is safe and comfortable. Avoid burning, and do not skip sun protection when the sun is strong.

Signs of deficiency

Cleveland Clinic says adults may have fatigue, bone pain, muscle weakness or cramps and low mood, or no symptoms at all. Severe deficiency in children causes rickets, and in adults it can soften bones (osteomalacia). These signs are not specific, so a blood test is the way to confirm. Routine testing is not usually done; doctors often order the 25-hydroxyvitamin D blood test when there are symptoms or risk factors.

Supplements: only with your doctor

The NHS says people who are rarely outdoors, who cover most of their skin when outside or who have dark skin may need a supplement all year, and advises that everyone consider one in autumn and winter in the UK. Those seasons do not apply in the same way to India, which is another reason to rely on your own doctor.

• Do not start high-dose products on your own. The NHS warns that too much vitamin D can raise blood calcium and harm the bones, kidneys and heart.
• MedlinePlus says calcium amounts of 500 mg or less at a time are absorbed best, and calcium carbonate is best taken with food.
• The NHS says taking over 1,500 mg of calcium a day can cause stomach pain and diarrhoea.

Your doctor may prescribe a supplement and tell you how long to take it, especially in pregnancy, after menopause or when other conditions are present.

When to see a doctor

• Persistent bone pain, muscle weakness or frequent cramps
• A fracture from a minor fall
• Planning pregnancy, or pregnant or breastfeeding, and unsure about supplements
• Menopause, or a family history of osteoporosis
• Long-term illness or medicines that affect bones

When to be cautious: Severe bone pain, an unexpected fracture, or confusion, nausea and extreme thirst after taking supplements need medical attention. Bring the supplement packaging with you.

What to expect at the doctor

Expect questions about diet, sun exposure, clothing, periods and pregnancies. The doctor may order a vitamin D or calcium blood test. Antenatal visits often cover these nutrients too; see antenatal check-ups.

Talk to a doctor

Not sure whether you need a vitamin D test or a supplement? A short consultation can guide you without guesswork. You can book an appointment or call +91 944 103 0587. This article is for general awareness and is not a substitute for a doctor's advice.