Good grief. Just opened a jar of Mauna Loa macadamia nuts and they are SO rancid.. I'd say about half the macadamias out there are at some level of recognizable rancidity. Taco Bell sells the hell out of rancid shells and chips and there's usually some level of rancidity in the chips at every Mexican restaurant around Nashville. Snickers peanuts used to be rancid I'd say about 85% of the time until incorporating the foil wrapper. I think people don't recognize the aroma/taste. And those peroxide levels can be toxic..