A fellow who I used to correspond with in the past had a quote on Conte's goings-on about this which I thought amusing, on the absurdity of the idea that man needs to take in these nutrients at different times -- it's between two cavemen:
"Zog, don't you know you can't eat those roots and that deer penis at the same time? The calcium in the roots will fuck up the absorption of the zinc from the deer penis!"
Simply because absorption is greater when the nutrients are separated doesn't mean you need to do it. We are evolved to consume them at the same time and it DOES work.