Hi, guys.
I've been wondering if coffee can induce a zinc deficiency through increased urinary losses. I googled it and came accross three studies that seem to contradict each other.
The first study is on rats: http://www.ncbi.nlm..../pubmed/3944663
It says caffeine has no effect on urinary zinc levels.
The second study is on 15 people (males): http://www.sciencedi...271531785800713
Again the conclusion is that coffee doesn't affect zinc metabolism.
However I came accross a third study done on women and the results indicate that caffeine load increases urinary zinc loss three-fold, which is a total shock to me! Here's the study: http://jn.nutrition..../2/393.full.pdf < Scroll down to table 3 for the results.
Any ideas about this issue and why the studies are contradictory? Any more info on this subject?
