US cereal maker General Mills has said it plans to make all of its major breakfast cereals with whole grain in order to meet consumer demand for healthier products.

The company said its major brand breakfast cereals, such as Trix, Golden Grahams, Lucky Charms and Rice Chex, will now be either a "good" or "excellent" source of whole grain. Its established whole grain cereals such as Cheerios, Wheaties, Total and Wheat Chex have not been changed.

General Mills said it had conducted extensive taste tests across the country in order to make sure taste was not compromised while increasing the whole grain content of the cereals.

The company also unveiled new packaging with "Whole Grain" labelling, which will  start to appear within the next few weeks and continuing on into the New Year, depending on the brand.

"Eating more whole grain could have a significant impact on the overall health of Americans," said Dr. David Kessler, former Commissioner of the US Food and Drug Administration. "The science shows a strong connection between whole grain and a reduced risk for heart disease, cancer, diabetes and obesity, which are the biggest preventable killers in the United States."