Why did big, curvy become ugly?

Biologically speaking it's a known fact that men perceived women who had bigger butts to be ideal for reproduction , bigger breasts better for breastfeeding , so why do men now see bigger women as not beautiful?
Why did big, curvy become ugly?
Why did big, curvy become ugly?
Why did big, curvy become ugly?
Why did big, curvy become ugly?
Why did big, curvy become ugly?
Why did big, curvy become ugly?
Why did big, curvy become ugly?
Post Opinion