Polyunsaturated fats are healthy fats whcih we can get from eating greeny leaf vegetables, fish and some seeds that are helpful in brain functioning, nutrient rich blood, hair growth, etc...
Mercedes's language in reference to the story "Call of the Wild" actually means civilization. She had brought numerous belongings along with her and they were much more than the dogs could pull. Her decision of not parting with any of the belongings would ultimately lead to her death. One can easily draw a clear difference between civilization and wildness.