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Old 23.01.2009, 20:40
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Hard water as a source of calcium??

I was randomly searching on words I found in the lab report from my latest bloodtests and found the following site with a recommendation to drink a glass or two of 'hard' water each day as this will provide calcium from the calcium carbonate and thus reduce the risk of thinning bones.

http://www.scene.ie/issue82/health_tips.shtml (it's the 10th bullet point or thereabouts, the one that begins with advice to eat dried figs)

Now, I think the whole calcium thing is probably a bit far-fetched but I'm no chemistry genius. Can anyone confirm/deny if it's true?
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Old 23.01.2009, 21:05
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Re: Hard water as a source of calcium??

Most of your calcium stores are laid down prenatally - the pregnant mother needs to have good stores, as well as iron, vit c, and vitamin D to grow good 'baby bones'...

Have a look what the RDI is for calcium (recommended dietary intake) daily.

http://www.specialtyminerals.com/spe.../calcium-rdis/

then have a look what the calcium content is of 'hard water'...

http://en.wikipedia.org/wiki/Hard_water

It's about 100mg per litre for 'hard water' - by definition - so if you drank a litre of water a day, you'd be getting maybe 1/10 of your daily requirement from that (you would probably die if you drank 10 litres of water in a day - there is such thing as water poisoning)...

http://en.wikipedia.org/wiki/Water_intoxication

Vitamin D and Calcium are interrelated - you need adequate vitamin D to be able to absorb and metabolise calcium. To get Vit D the best thing is 5-10 minutes per day of direct sunlight on the hands, lower arms and face...

Oh yes, and I think smoking is a big factor in Osteoporosis...
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Old 23.01.2009, 21:15
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Re: Hard water as a source of calcium??

I'm not a chemist by training but I am a biochemist. On its face the statement seems like it would pass the test for plausible. Calcium carbonate is used as a calcium source in supplements. However, it would be better for you not to rely on drinking hard water for proper calcium intake. A proper diet would be better. The best source of calcium in the diet is milk, which contains calcium in easily absorbed form, plus it tends to be fortified with Vitamin D, which helps with calcium absorption. Thus Vit D fortified milk, not hard water should be your "supplement" of choice. Other than this, eat some cheese, or broccoli. Of course, this is assuming the calcium in the hard water is carbonate, and not sulphate or some other mineral. The tests for measuring hard water tend to measure total Ca or Mg content, and wouldn't differentiate, but it would seem that a glass of hard water could be the source of a days worth of calcium if it was all in carbonate form. Unfortunately, if you ingested that amount all at once, it would not all be absorbed so you would probably need at least two glasses during the day, and possibly three or four, to actually get your daily calcium.
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Old 23.01.2009, 21:33
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Re: Hard water as a source of calcium??

Wow. This forum is amazing. I thought the whole 'calcium in water' thing wasn't even true and fully expected to be told I was a gullible moron for even entertaining it as a possibility.

They'll be calling me 'bones of steel' when I'm ninety!
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Old 24.01.2009, 12:10
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Re: Hard water as a source of calcium??

Sesame seeds, almonds, leafy green veggies, Molasses, tahini, cooked brocoli, veggies, veggies and more veggies!

And you will be getting awesome intake of calcium!
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Old 24.01.2009, 13:05
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Re: Hard water as a source of calcium??

If we got calcium from the water around here my family would have exoskeletons by now- I get a decent mineral deposit in a pot just making pasta!
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