He said the government should set up an independent body of experts to integrate information on all aspects of food's impact, including how healthy it is, its environmental effects and the social consequences of the way it is produced.
This could be translated into easily accessible information on food labels for consumers such as "food flowers" in which each petal indicates a food's impact in a different area.
He acknowledged that this would be an extremely complex task, but said that consumers wanted reliable information. "The classical approach to this is to let prices and the consumer decide. But health and environment, justice and equity are all surely reasonable and decent aspirations," Lang told the British Association Festival of Science in Liverpool, "We need a food system to improve standards across a variety of equally important fronts."
He hoped that his proposed "omni-standards" would help consumers to navigate contradictory information.
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