Is this over reach or should coke and pepsi have changed the process on their own to potentially protect the public since it would have no affect on their products before a law was passed?

Coca-Cola and Pepsi are changing the way they make the caramel colouring used in their drinks as a result of a California law that mandates drinks containing a certain level of carcinogens bear a cancer warning label.

The companies said the changes will be expanded nationally to streamline their manufacturing processes. The changes have already been made for drinks sold in California.

Coca-Cola and Pepsi account for almost 90% of the soda market, according to industry tracker Beverage Digest.

The American Beverage Association, which represents the broader industry, said its member companies will continue to use caramel colouring in certain products but that adjustments were made to meet California's new standard.

"Consumers will notice no difference in our products and have no reason at all for any health concerns," the association said in a statement.