The Duchess of Windsor may have said that you can never be too rich or too thin, but that's a rather modern point of view. In earlier times in Europe, being overweight was considered a sign of wealth and well-being, as demonstrated by the corpulence of many European kings. Still today, corpulence is thought to be superior to thinness in some of the world's cultures. But corpulent and corpulence are less often used than they once were, and we're now probably more likely to say "obese" and "obesity".