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There was a time when full tables signified prosperity and thick waistlines were considered attractive. The ability to eat one’s fill was what separated the gentry from the peasant making do with a few crusts and salted leftovers. Fat was in because it represented leisure and wealth. Thin meant you were on the road to the poorhouse or to consumption, which meant your body was being consumed, not that you were the one doing the consuming.
Then feudalism went the way of the dodo, agriculture was revolutionized and starvation went extinct in the West. Between the widespread availability of cheap food and social welfare programs covering everything from soup kitchens to food stamps, it became hard to starve. Not only was the availability of food no longer associated with prosperity, but even the poor had begun to eat so well that fat began to carry working class and lower class associations.