Concerns have been raised about genetically modified (GM) cottonseed oil being included in food products in Australia.
Indefinite or temporary bans are in place in most Australian states to prevent the growing of GM food crops.
Entomology expert Rick Roush, from the University of California, says the fact GM cottonseed oil is used in fast food preparation and sold as vegetable oil makes a mockery of the GM-free claims of some states.
"Its really a polite fiction to claim that cotton is not a food crop because roughly 40 per cent of our cooking oil comes from cotton.
Australian cotton growers say GM crops are a benefit to their industry and the environment, despite the concerns about cottonseed oil.
It is estimated about 90 per cent of cotton farms in NSW and Queensland cultivate GM cotton.
Chairman of Cotton Australia, Geoff Hewitt, says GM crops have been grown in Australia for up to seven years.
"In the early days it performed to a mediocre level but latterly were getting great results from the GM crops that were growing, both the herbicide and the insect resistant lines," he said.
"Were absolutely convinced that this is where the future in agriculture lies, not only in the cotton industry but globally."
The national GM watchdog, the Office of the Gene Technology Regulator (OGTR) has granted 34 licenses for field testing of GM crops.
GM trials are underway in NSW, Tasmania, WA, Queensland and Victoria.
The OGTR has concluded that seven varieties of GM canola pose no greater risk to human health, safety and the environment than non-GM canola.
GM cotton, which has been cultivated in Australia since 1996, is the only GM crop in commercial production.
OGTR has approved commercial production of GM canolas in Western Australia, South Australia, NSW, Victoria and Tasmania but they have either imposed moratoriums on canola, or declared themselves GM-free.