What Happens to Your Bones When You Don’t Get Enough Calcium

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Calcium is one of the most important minerals for maintaining strong, healthy bones, yet many older New Zealanders do not get enough of it through their daily diet. Understanding what happens inside your body when calcium levels drop can help you take simple steps to protect your bone health as you age.

Your bones are living tissue that constantly renews itself. Old bone is broken down and replaced with new bone in an ongoing cycle. Calcium plays a central role in this process, providing the structural strength bones need. When your body does not get enough calcium from food, it begins pulling calcium from your skeleton to keep other vital functions, such as muscle movement and nerve signalling, working properly. Over time, this constant withdrawal weakens bone density.

For seniors, this gradual thinning of bone tissue can lead to a condition called osteoporosis, where bones become fragile and more prone to fractures. Even a minor fall or bump can result in a serious break, particularly in the hip, wrist or spine. Reduced bone density can also contribute to poor posture, loss of height and ongoing back pain, all of which can affect independence and quality of life.

Ageing naturally reduces the body’s ability to absorb calcium, and hormonal changes after menopause can speed up bone loss in women. This makes it especially important for seniors to be mindful of their calcium intake and overall bone health.

The good news is that there are practical ways to support strong bones. Eating calcium-rich foods such as dairy products, leafy greens, almonds and canned fish with soft bones can help maintain healthy levels. Pairing calcium with adequate vitamin D is equally important, since vitamin D helps the body absorb calcium effectively. Spending time outdoors in natural sunlight, when safe to do so, can support your vitamin D levels naturally.

Regular weight-bearing exercise, such as walking, gardening or light strength training, also helps stimulate bone strength. Speaking with your doctor about a bone density check or discussing whether a calcium or vitamin D supplement is right for you can provide further peace of mind.