Ayup, very true. The belief that fat = good persisted throughout history until more recent centuries.
This is off on a tangent a bit, but eating "white" breads and foods was seen as "good" and persists to today, despite the scientific research that shows the benefit of "brown" (whole grain, etc.) foods that were previously snubbed by the wealthy.
Maybe that is somehow tied to the plump = good thing. Many societies today find shapely women to be more attractive, like in Brazil.