What impact of fast food on local diets does Schlosser mention?

The impact of fast food on local diets that Schlosser discusses revolves around the concept of homogenization. He highlights how fast food chains contribute to a uniformity in global diets, where the same brands and menu items are available in different locations around the world. This widespread proliferation of fast food can overshadow local culinary traditions and unique food offerings, leading to a decline in culinary diversity. Instead of celebrating regional flavors and dishes, the prevalence of fast food fosters a sameness that can diminish the distinctive culinary heritage of various communities. This aspect of homogenization is significant because it illustrates how global fast food practices can reshape local eating habits and preferences towards a more standardized diet.