I guess more commonly, fast food/take away are the most commonly eaten by people of western cultures. These include all that in which popular franchises like Macdonald's & KFC (Kentucky Fried Chicken) sell. However, if your asking what people eat for breakfast in particularly, not everyone chooses to endulge in Maccas every morning. Automatically when i think breakfast, i think: cereal, toast, coffee, eggs & bacon. That would be generally speaking, but in reality who knows what people eat in the western world. There's so much choice, too much even.