Mineral water can be a good source of calorie-free calcium 

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Instead of drinking milk or taking supplements to get adequate amounts of calcium, calcium-rich mineral water is an equally good source, researchers say.

“The special feature of mineral water as a source of calcium is a calorie-free alternative to milk and dairy products,” Theresa Greupner of Leibniz University Hannover in Germany told reporters.

“In a world with a steadily growing number of overweight and obese people, it is important to reduce the energy intake and to promote alternatives to satisfy the calcium demand apart from high caloric milk and dairy products.”

Her team’s study, funded by the Association of German Mineral Water Bottlers, looked at how well the body absorbed calcium in five different products, each containing 300 mg calcium: three types of calcium-rich mineral water, milk, and a calcium supplement, reports Reuters.

Twenty-one men and women participated in the study. There was no difference in how calcium from the five different sources was absorbed, the researchers report in the Journal of the American College of Nutrition, online June 19. Other minerals in the water did not affect calcium absorption.

Most mineral waters list mineralization on the label and the higher the amount of calcium, the better the water is as a calcium source, Greupner said.

A person would need to drink two liters of 500 mg/L mineral water per day, or more than three eight-ounce cups of milk, to meet the German standard daily requirement of 1,000 mg calcium. In the U.S., 1,300 mg/day of calcium is recommended for adults.

It’s well known in Italy that mineral water can be a good source of calcium, Dr. Maria Luisa Brandi of the University of Florence in Italy told reporters.

Brandi, who wasn’t involved in the current study, and her colleagues showed in a 2004 study that calcium in mineral water was as well absorbed as calcium in milk.

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