5 hours ago, Margaret Pilgrim said:Rule #1: smell it. Rancid fats have a noticeably off scent.
Smell tests for problems with food are dangerously unreliable.
QuoteMost bacteria that cause infection or illness don't omit an odour, so sniffing will do little other than let you know if a food is getting old.
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You may be able to detect rancidity by smell, but there are a host of pathogens which have no scent. E. Coli for example.