I forgot...Does the calicum block the iron or vice versa??
Calcium and iron compete for the same digestive receptor sites, so if you eat both calcium and iron at the same time, you're only going to be able to absorb half of each. If you're an RNY patient you're already going to have some malabsorption so this is doubly problematic. Thus you should make sure you separate your iron and calcium intake (whether supplements or "real food") by at least two hours before and after.