Your saliva also carries information about who you are, your level of health.and mucous membranes in our mouth are permeable to hormones like testosterome, making a kiss a way to taste test a potential mate.
Beyond their printed dates, ready-to-eat salads, deli meats, and unpasteurized cheeses are more likely to carry pathogenic bacteria that can slip past a smell or taste test.
Bubblegum is akin to the likes of blue raspberry—it doesn't exist in nature, but if you tried it in a blind taste test, you'd likely recognize it right off the bat.