According to the findings, daily supplements of calcium (1000 mg/day) plus vitamin D (400 IU/day) for seven years increased the risk of urinary tract stones by 17%, compared with placebo.
However, as many of you reading this would know, one of my favourite vitamins currently is vitamin K. What's interesting is that we have numerous vitamin K-dependant proteins in the body. You may remember me discussing the whole "calcium causes heart attacks" thing (and another post on vitamin K being needed to activate osteocalcin to pull calcium into the bones, and activating MGP that keeps calcium out of soft tissues like the arteries).
Well, nephrocalcin is a vitamin K-dependant protein present in the kidneys and urinary tract, which (when activated by vitamin K) inhibits calcium oxalate crystal growth.
So as long as you're getting enough vitamin K (ideally K2), there's no need to panic about this new study on the negative effects of calcium.
If you're not taking a vitamin K supplement yet...what are you waiting for?
Hope my Canadian and American readers have a great Canada Day or Independance Day long weekend. Come back with a refreshed brain, 'cause I'll throw some more goodies at you next week.
Source: Urinary tract stone occurrence in the Women's Health Initiative (WHI) randomized clinical trial of calcium and vitamin D supplements
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