I'm thinking that the fertility symbols where the woman is fit and thin far outnumber the ones where the woman is visibly obese. Wide hips, large bosom, healthy layer of fat, most certainly. But obesity? Rare. India, Egypt, Rome. All those sculptures look to be in the confines of healthy weight. I doubt that people living in that age had access to TV or magazines. Looks to me like you're quite obviously cherry-picking.
Not deliberately cherry picking, simply picking a time before great royal families and extravagant emperors had an impact on fashions and culture. Don't get me wrong, I'm no expert on this (just a passing interest) so happy to be informed otherwise.
Side note: there's an interesting theory in Ann Sinnott's Breastfeeding Older Children about fertility / female symbols and their relation to patriarchy and our 'progress' from nomadic hunter gatherers. The theory goes that as we settled down into working the land / raising animals, where women were obviously needed more, they became less valued for child birth / child rearing and consequently these fertility symbols not only got slimmer, but started to be replaced by a greater quantity of male / phallic symbology.
Only vaguely related to the topic at hand but hugely interesting (to me, anyway!)
