A woman has uncovered a 'genius' guide to help prevent fruit and vegetables from going stale too quickly - and it seems most are using their containers the wrong way.The re-surfaced Tupperware guide outlines how the vent on the lid of containers is the key to preserving freshness as different foods require different 'breathing levels'.Maree, from , shared a photo of the guide that listed various foods and whether they were 'heavy', 'medium', or 'light' breathers).
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