Can high obesity rates be explained by a sort of Predictive Evolution?

Perhaps the sub-conscience or precognitive functions mixed with evolution has produced a current "survival of the fattest" of sorts. Maybe deep inside the souls of many, these KNOW that times of famine and tribulation are near at hand and they have grazed in these pleantiful days to sustain themselves. It would be ironic for the "wafes" and such to be excluded from the future just because of their vanity.