Hilde could you have misunderstood what you read?
How to Improve the Body's Absorption of Vitamins | Healthy Eating | SF Gate
Fat-soluble vitamins A, D, E and K require fats to be absorbed.
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There are many other sources that state the same thing, I just picked this one because it was first on the Google hits this time around.
Calcium And Fat Absorption | LIVESTRONG.COM
Calcium helps maintain bone health and plays a role in a number of other functions, from muscle contraction to nerve function. In addition, evidence indicates that following a diet high in calcium may reduce fat absorption and increase fecal fat excretion.
Fats are digested into fatty acids and glycerol in the small intestine and are absorbed by the intestinal wall into your bloodstream. If fat is not absorbed, it’s pushed through to the large intestine and excreted as feces, which is measured as fecal fat excretion. Scientists at the University of Copenhagen in Denmark discovered that subjects following a high-calcium diet experienced increases in fecal fat excretion compared with those who adhered to a low-calcium diet. The findings were published in the November 2010 issue of the “British Journal of Nutrition.”
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Again, there are other sources out there, but I don't have time to dig up more/others.
Basically, too much Ca interferes with fat-soluble vitamin absorption.
I was told this many years ago by a nutritionist and doctor when counselling me for a medical condition, so I'll consider them as a source as well, though I can't provide the proof since it was all verbal.
If you have the time you can find all kinds of evidence for, and against, Ca vs. Vitamins. Allen Repashy has stated "Too much calcium, even without too much D-3, becomes a binder for essential vitamins and nutrients. Vitamin A in particular. The calcium blocks the absorbtion of these vitamins." His entire write-up can be found online.