sentences:  A significant proportion of cereals are made with high sugar content.Many are marketed towards children, feature a cartoon mascot, and may contain a toy or prize.Between 1970 and 1998, the number of different types of breakfast cereals in the U.S. more than doubled, from about 160 to around 340; the forecasted trend for 2012 was 4,945 different types based on the mass customization of online shopping.