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Foods 'should label up eco-costs'
The guides would help consumers navigate their way through the ethical and ecological decisions about what they eat, the proponents argue.
The UK should lead Europe on this approach, food policy expert Professor Tim Lang said.
He was speaking at the British Association Science Festival.
The criteria used to judge food sustainability are still up for debate.
"Do I eat green beans from Kenya, because they are good for me, or do I say no because there are four litres of water embedded in each stem of green bean?" asked Professor Lang, from City University, London.
He said scientists and policy-makers now realised the environmental, ethical, and health impacts of the food we ate.
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