I think the preference for thin is completely marketing. However, the overwhelming amount of 'big' people (me being one) is a historically recent event. Before the overabundance and availability of processed and sugar laden food, the human population was thinner. We had to work harder and eat better because that was the way of life. I believe that there is an instinct towards healthy mates, but the stark contrast between thick and thin has become greater in the last 100 years.
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