Emeritus Prof Frank Griffin sees alternative foods as a "wake up'' call for conventional farming.
Prof Griffin has spent a career in animal health research and also has a strong interest in New Zealand's food production systems.
Speaking at the Otago Ballance Farm Environment Awards field day at the Wallace family's property in South Otago on Friday, he said alternative foods were an opportunity if handled the right way.
There were big issues in farming and the sector was dealing with a new set of challenges ``that didn't exist for our grandparents''.
When it came to the future, traditional farming could not be driven any further and the sector had to start reconsidering the way it did things - not necessarily getting bigger, but rather, perhaps getting smaller.