Label every leftover container with the date before it goes in the fridge
Removes the guessing game that ends with most leftovers in the bin.
Why it works
Unlabeled leftovers get pushed to the back and skipped because nobody is sure how old they are, so they get thrown out on suspicion rather than eaten. A date on the lid turns that guess into a fact, which is usually enough to get it eaten within its safe window instead of discarded early out of caution.
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