Dr Blewett said he believed a range of companies would voluntarily use traffic light labelling on their products, not just those that could display a green mark.

凯特博士相信一些公司会愿意在他们的食品上使用“红绿灯”标签办法，而不仅仅是在产品上贴一个绿色标签。

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In consumer tests, the traffic light performed better than rival labelling schemes.

在消费测试中，红绿灯明显比标签系统更有效的多。

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They said many measures - including taxes on unhealthy food, restrictions on junk food advertising, traffic light labelling and school-based education programmes - would save money as well as benefit health.

BBC: Global governments 'must get tough on obesity'

Which? compared the nutritional content of the bars using the manufacturers' information and applied traffic light labelling to see if the levels of fat, saturated fat, sugar and salt were high, medium or low.

BBC: Cereal bars: Healthy image a myth - Which?

One of the papers said steps such as a tax on unhealthy food and drinks and traffic light labelling on food would be so beneficial for health that they would save money in the long run.

BBC: Obesity: The story so far