Larsen also points to Weight Watchers for convenience, as the company has increasingly begun working with food manufacturers like Smart Ones to include their Points system information on packaging.

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Dr Zwiazek also contested the suggestion that information about the problem had been placed on the Rapid Alert System for Food and Feed (RASFF) last Saturday.

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The Agricultural Market Information System, which was established last year and allows the world's major food producers to work off common data as well as providing a forum for discussion, has played an important part.

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