That's why she is speaking out about the federal government's Gene Technology Amendment which will bring more GMOs - Genetically Modified Organisms, into the food chain.

This means families could be eating untested and unlabeled genetically modified foods - including animals.

Greens Senator Janet Rice put forward a motion to reject the amendments in federal parliament last week. It will be presented to the senate again on September 17.

Slow Food Australia says there is scientific evidence that new Genetically Modified (GM) techniques have risks attached to them that need to be assessed and managed by independent experts.

The not-for-profit group wants gene-edited organisms to go through a stringent safety assessment before they are released into supermarkets and the environment.

Ms Dempster, the Slow Food Earth Market Maitland chairwoman, said the effect on human health was a huge concern.

"We really don't know the long-term effect of GMOs on human and animal health - if we give GMO foods to animals that is going to end up in human bodies because we are what we eat," she said.

"The information isn't there that proves it is completely safe for human consumption and it won't alter our own bodies and make us sick. At the end of the day all foods must pass some form of regulation and scientific information must be there."

Ms Dempster said the concept of genetically modified food was a world apart from the Slow Food Earth Market Maitland where farmers regularly used seeds that had been saved, and heirloom varieties, to bring shoppers a wide variety of authentic choices.

"If we are providing good clean and fair food for our communities then we need to make sure that food hasn't been modified in any way for commercial purposes," she said.

"We have local farmers who are growing heritage varieties and bringing back a lot of taste and flavour and we want them to continue doing that. There might be less opportunity for farmers to be able to access seeds that have been saved and to be able to grow from seeds."