"From a calorie and nutrient standpoint, cereal may be the best breakfast choice you could make. In fact, kids who eat cereal more frequently, including presweetened cereals, tend to weigh less than kids who eat cereal less frequently -- and they are better nourished," said General Mills spokeswoman Heidi Geller. General Mills produces Reese's Puffs, Lucky Charms, Cinnamon Toast Crunch, Trix and Cookie Crisp, among others.
Kellogg spokesman Kris Charles said the company developed a Global Nutrient Criteria; children's cereals that did not meet the new standard were reformulated, or the company stopped marketing them to children under 12. Charles added that from 2006-09, Kellogg reduced its advertising to children under 12 by about 50 percent. Among Kellogg's cereals for kids are Corn Pops and Froot Loops.
PepsiCo, which owns Quaker and Cap'n Crunch, said it is working to further improve the nutrition profile of that cereal.
"As an industry leader in responsible children's marketing, PepsiCo is making ongoing efforts to voluntarily apply a rigorous transformation of its portfolio to meet consumer needs, including products like Cap'n Crunch cereal," spokeswoman Candace Mueller told ABC News.
Top ten advertised cereals to children with poorest nutrition rating, according to the Cereal F.A.C.T.S report:
1. Reese's Puffs
2. Corn Pops
3. Lucky Charms
4. Cinnamon Toast Crunch (tied)
4. Cap'n Crunch (tied)
6. Trix (tied)
6. Froot Loops (tied)
6. Fruity and Cocoa Pebbles (tied)
9. Cocoa Puffs
10. Cookie Crisp
ABC News' Kelly Hagan and Kate McCarthy contributed to this report.