It’s the spark behind every move you make
Mention calcium and most people think of one thing: strong bones. A glass of milk, a bit of cheese, job done.
But here’s what most people don’t know. Your bones are only part of the story. Calcium is also one of the main messengers your nervous system uses to get things done. Every time you think, move, feel or react, calcium is involved.
How your nerves actually talk
Your brain and body are linked by billions of nerve cells. They pass messages along like a relay team, and the baton is a tiny electrical signal.
The clever bit happens at the gap between two nerve cells. When a signal reaches the end of one nerve, little gates open and calcium rushes in. That rush of calcium is the trigger that releases chemical messengers into the gap, and those messengers pass the signal on to the next cell.
No calcium, no handover. The message stops there.
So whether you’re picking up a coffee, holding a plank or remembering where you left your keys, calcium is quietly doing its job thousands of times a second.
It switches your muscles on (and off)
Once the message reaches a muscle, calcium is needed again. Inside each muscle fibre, calcium is released and acts like a key that lets the muscle fibres grip and pull. When the calcium is cleared away, the muscle relaxes.
Your heart works the same way. Every single beat relies on calcium moving in and out of the heart muscle cells.
That’s why calcium matters just as much for a good workout as it does for your skeleton. Strength, coordination and smooth movement all depend on it.
Your bones are the bank account
Your body treats the calcium in your blood as non-negotiable. It keeps the level within a very tight range, because your nerves, muscles and heart can’t work properly without it.
If you’re not getting enough from your food, your body doesn’t let your nerves go short. It quietly withdraws calcium from your bones to top up your blood instead.
In the short term you won’t notice a thing. Over the years, though, regular withdrawals with not enough deposits can leave your bones weaker than they should be. So “calcium for strong bones” is true, but it’s really the second half of the story. Your nervous system gets paid first.
How much do you need?
The NHS recommends around 700mg of calcium a day for most adults. The good news is you don’t need anything fancy. It’s all in your normal supermarket shop:
- A glass of milk or a pot of yoghurt. Each one gives you roughly a third of what you need for the day.
- Cheese. A matchbox-sized piece of cheddar does about the same.
- Oat, soya or almond milk. Most brands have calcium added, including supermarket own brands. Just check the label.
- Breakfast cereals. Many have calcium added, and the milk you pour on top counts too.
- Bread. Most UK flour has calcium added by law, so your toast and sandwiches are quietly helping.
- Baked beans. A handy extra on toast or with a jacket potato.
- Green veg. Kale, broccoli, spring greens and cabbage all chip in.
- Tofu. If you use it, look for “calcium sulphate” on the pack.
- Snacks. Almonds, dried figs and oranges all add a bit.
Something as simple as cereal with milk at breakfast, a cheese sandwich at lunch and some greens with dinner will get most people there.
Calcium needs a team
Calcium doesn’t work alone. Two helpers decide whether the calcium you eat actually gets where it needs to go: one that gives it a stage, and one that keeps it in check. They’re vitamin D and magnesium, and they’re so important they each get their own post, coming next in this series.
Strength training. In the meantime, there’s one helper you control completely. Your bones respond to the work you ask of them. Lifting weights, bodyweight exercises and anything with a bit of impact send a signal to your bones to stay strong, so the calcium you eat gets put to good use.
Do you need a supplement?
Most people can get enough calcium from food, and food is the best way to do it. That includes vegetarians and vegans. Calcium-added plant milks and yoghurts, tofu, bread, beans, greens like kale and broccoli, almonds, sesame seeds and dried figs can easily cover your day. (Spinach is the one green that disappoints, as your body can only use a small amount of the calcium in it.)
If you’ve been told you’re at risk of weaker bones, or you’re unsure whether you’re getting enough, have a chat with your GP or pharmacist before reaching for a supplement. More isn’t always better.
The takeaway
Calcium isn’t just about your bones. It’s the spark that lets your brain talk to your body, your muscles move and your heart keep its rhythm. Your bones are where your body keeps its savings.
Look after your calcium, keep moving and keep lifting, and you’re looking after the whole system, not just the frame it hangs on.
Next time: meet vitamin D, the festival your body can’t do without.
If you’d like help building strength in a way that feels good and fits your life, book a free taster session or start a 14-day trial of the DV Coaching Studio.