Because one study equals universal truth, I give you the Latest from New Scientist:
Want to live a little longer? Get a second wife. New research suggests that men from polygamous cultures outlive those from monogamous ones.
After accounting for socioeconomic differences, men aged over 60 from 140 countries that practice polygamy to varying degrees lived on average 12% longer than men from 49 mostly monogamous nations, says Virpi Lummaa, an ecologist at the University of Sheffield, UK.
If our Fearless Leader really wants to improve my health, he should evidently be twisting arms to legalize plural marriages.
[Also, take a skim of the comments. Even of those defending plural marriage, nearly all of them are assuming "polygamy" has to be one man with multiple wives.]