We almost always have leftovers which makes Sustainable PF very happy as they make up most of his weekly lunches. Just last night we had some leftover macaroni and cheese. Before putting the leftovers into meal size containers I let the macaroni cool down. Not long enough so its starts to go bad but just long enough for the heat to leave it. Once leftovers are cooled down I put them away in the fridge and the fridge does not have to work overtime to cool the food down.
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That’s exactly what we do too. For exactly the same reason. Great advice!