Calcium and Vitamin D: The Building Blocks of Strong Bones
Strong bones support you through every stage of life. Two nutrients work together to keep them healthy: calcium, the main mineral that makes up bone, and vitamin D, which helps your body absorb that calcium.
Why calcium matters
About 99% of the calcium in your body is stored in your bones and teeth. Calcium also helps your muscles contract, your nerves send signals and your heart beat normally. When you do not get enough from food, your body takes calcium from your bones, which can weaken them over time.
Why vitamin D matters
Vitamin D helps your gut absorb calcium from food. Without enough vitamin D, even a calcium-rich diet may not fully protect your bones. Vitamin D also supports muscle strength and normal immune function.
Signs your levels may be low
- Muscle cramps, aches or weakness
- Tiredness and low energy
- Bone or joint pain
- Weak or brittle nails
- Frequent fractures, or a loss of height over time
These symptoms can have many causes. A simple blood test can check your vitamin D level — ask your doctor if you are concerned.
Who is at higher risk?
- Women after menopause, as bone loss speeds up
- Older adults
- Pregnant and breastfeeding women
- People who spend most of their time indoors
- People with conditions that affect absorption, such as certain gut or kidney diseases
- Those who avoid dairy or follow restrictive diets
How much do you need?
Needs vary with age, sex and life stage. As a general guide, the ICMR–National Institute of Nutrition recommends around 1,000 mg of calcium and 600 IU of vitamin D a day for most adults. Your doctor may advise a different amount based on your health.
Everyday sources
Calcium
- Milk, curd, buttermilk and paneer
- Ragi (finger millet)
- Sesame seeds (til)
- Green leafy vegetables such as amaranth and drumstick leaves
- Small fish eaten with bones
- Rajma, chana and other pulses
Vitamin D
- Safe, regular exposure to sunlight
- Oily fish such as sardines and mackerel
- Egg yolks
- Fortified milk and foods
- Mushrooms exposed to sunlight
Habits for stronger bones
- Stay active: walking, climbing stairs, dancing and light strength training help keep bones strong.
- Limit tobacco and alcohol: both are linked to bone loss.
- Don't overdo salt and cola drinks: excess intake may affect calcium balance.
- Prevent falls: good lighting, non-slip mats and regular eye checks matter, especially for older adults.
A note on supplements
If your diet or a test shows you are not getting enough, your doctor may suggest a calcium and vitamin D supplement. Take it exactly as advised. More is not better — too much calcium can cause constipation and, in some people, kidney stones or high calcium levels in the blood. Always tell your doctor about any supplements you take.
This article is for general health awareness only and is not a substitute for professional medical advice, diagnosis or treatment. Always consult your doctor about your own health.
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