Cereal

Cereal is a food made from processed grains. Though it's normally eaten for breakfast, the doctors in Grey's Anatomy eat it all day long, preferably out of the box.

SUPER BRAN
While talking to Izzie about Meredith's continous string of one-night stands, George ate a bowl of family sized SUPER BRAN.

NUTS & MORE
When Cristina and Burke refused to speak to each other, Cristina ate NUTS & MORE for dinner when Meredith and Derek were invited over. ("Great Expectations")

Later, in a dream, Cristina was eating the same brand of cereals. ("Dream a Little Dream of Me, Part 2")

Notes and Trivia

 * In the second to last episode of Lost, a cereal brand named SUPER BRAN as well appears.