Apparently. In our house I would say that the figure is more like 5%. Many left overs and rotten things are easily scoffed tween the birds (bread, apples), squirrels(apples), foxes (all meaty things) and our cats (fat cut from bacon etc). Very few things are thrown out because they are past their sell by date or have gone off. We shop too frequently for that to happen. How efficiently do you eat all that you buy?