Campbell Soup Co said it will label all its US products for the presence of ingredients derived from genetically modified organisms, becoming the first major food company to respond to growing calls for more transparency about ingredients.

The world's largest soup maker also said it supports the enactment of federal legislation for a single mandatory labeling standard for foods derived from genetically modified organisms (GMOs) and that it supports a national standard for non-GMO claims made on food packaging.

The company, which also makes Pepperidge Farm cookies and Prego pasta sauces, said it would withdraw from all efforts by groups opposing such measures.

Several activist groups have been pressuring food companies to be more transparent about the use of ingredients, especially GMO-derived ones, as questions are being raised on their effects on health and the environment.