Dairy products are widely believed to be the best sources of calcium. In reality, many other foods contain more calcium per gram than milk, yogurt or cheese. For example, 85 grams of sardines have more calcium than 113 grams of cow's milk. So for those who experience milk-related digestion problems, plant or fish sources of calcium will easily provide them with the daily-recommended amount that they need.
If we have too little calcium, our bones become prone to breaking. Too much, and kidney stones develop and constipation sets in. So, consuming the right amount for one's age is important. Remember that although calcium is stored in your bones and teeth, the best place from which to get your calcium is food; if you are not getting enough from food, your body will use your stored calcium. Over time, this depletion weakens bones and teeth. Other nutrients must be consumed along with calcium in order for it to be absorbed by the body, and these include vitamins D and K and magnesium.
Revised May 1st, 2016
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Calcium makes up one to two precent of our body weight, the most abundant metal in our bodies. Although calcium supplements are usually white, calcium itself is silver-colored.