Yes, you are completely allowed to eat and drink on the Shinkansen bullet trains, and it is a common practice for both local commuters and international travelers during long-distance journeys. Passengers can purchase bento boxes, snacks, and beverages at station kiosks before boarding or from the onboard vending machines and occasional trolley services. Many travelers enjoy a traditional railway bento box known as ekiben while admiring the passing scenery. However, passengers are expected to be considerate of their fellow travelers by avoiding overly pungent foods, keeping their seating areas tidy, and disposing of all trash responsibly in the designated bins located near the train car doors.