Let's follow the example! don't waste the food! Food that is good after expiry date A supermarket in Boston is going to sell only food that's past its sell-by date. So what are they, asks Rajini Vaidyanathan. In the US alone, 40% of food is thrown out, partly because of confusing date labels, telling consumers to "use by", "sell by" and "enjoy by" a certain time. Some of the dates are not about safety but taste, says Dana Gunders, a food scientist from the Natural Resources Defence Council (NRDC), which has issued a report saying much of the food labelled bad is actually perfectly edible. Early next year, businessman Doug Rauch, once behind the successful Trader Joe's chain in the US, is opening a supermarket and restaurant which will sell outdated food. So what are some of those foods? Tortilla chips aren't going to make you sick after a month, says Gunders, although they might start tasting stale. Putting them in an oven with oil wi...