The shape of American meals was determined by historical forces like the Industrial Revolution, and migrations to urban areas. Dinner used to occur mid day, and a light supper at night. Carroll chronicles the decline of the family dinner, and makes the point that while we spend much less time cooking than we used to, we spend a lot of time watching cooking shows on TV. Did you know that the modern version of breakfast was invented here in Michigan? This is a very readable history of American eating from colonial times through the present.