Does calcium cause the body to retain fluid? I can't find any information.
Since this is not my area of expertise, I searched Google under the key words "calcium 'fluid retention'" to get these possible sources:
http://www.mothernature.com/Library/Bookshelf/Books/10/113.cfm
http://www.betterhealth.vic.gov.au/BHCV2/bhcarticles.nsf/pages/Fluid_retention?OpenDocument
http://www.annecollins.com/water-retention-diet.htm
http://www.annecollins.com/weight_health/water-retention-treatment.htm
http://healthgate.partners.org/browsing/LearningCenter.asp?fileName=11492.xml&title=Pre-eclampsia
Use <Find> to search for calcium within these posts. It seems like calcium allows you to get rid of water.
I hope this helps. Thanks for asking.