Diners have the stomach for the fight to save leftovers, report Cecily Liu in London, Caroline Berg in New York and He Na in Beijing.

Every few weeks, Lu Jinhua's family meets for dinner at a restaurant close to her home in Beijing's Chaoyang district. But the happy mealtime almost always ends with an unhappy scene: Her children will insist that Lu leaves the table before she can embarrass them by asking to take the leftover food home in takeaway bags.

But on Sunday, the 63-year-old Beijing resident was delighted to discover that the restaurant had implemented a number of changes. A poster on the table clearly stated, "Save food, don't waste it". Instead of persuading customers to order a wide range of expensive dishes, the waitress suggested a small order that could be supplemented later if people were still hungry. At the end of the dinner, Lu's daughter even volunteered to ask the waitress for doggy boxes.