Rumour of the meat sandwich spread far and wide, Philadelphians say.

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In recent years, boutique sandwich bars, offering such fillings as foie gras with onion confit, have spread across the business districts of Paris, attracting long lunchtime queues.

ECONOMIST: Faster food replaces the leisurely lunch

They spread these films in alternate layers on top of sheets of cotton fabric and exposed the sandwich to ultraviolet light for 30 minutes to bond the layers covalently.

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Further afield in Seattle where chains are also now required to display calories (the practice also spread to California), a study of 37 sit-down and quick service burger, pizza, sandwich, and Tex-Mex chains in the area found fast-food entrees contained about 19 less calories only 18 months after the regulation was implemented.

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