This large-scale medical study looked at how if any factors might influence some similar health situations and lifestyles among couples who have lived together for a long time.

http://www.pubmedcentral.nih.gov/articlerender.fcgi?artid=1446505

Does your significant other share some same health lifestyle habits or certain health problems? Is the person very different or similar from you? From the researchers perspective, is to understand for further investigation if the food choices, sharing at home by a couple affects their health, when 1 partner wants to change to a healthy diet, but the other one doesn't, etc.

I didn't put this under marriage, because it does give those a chance who were married /coupled with someone else before, to still respond here.
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