I'm a chef who loves to shop at Costco - but there are 12 things I never buy there
Briefly

Nuts are high in natural oils, which can go rancid easily. Though roasting improves flavor, it decreases shelf life significantly. Buying single-variety packs of unroasted nuts maximizes freshness.
Husked corn is more convenient, but removing your own silk is worth the effort for better flavor and crunch. Corn that’s been husked can dry out and lose nutrients over time.
After you pry open a nearly 7-pound can of tomato sauce, you’ll likely have leftovers and it won’t last forever. Smaller cans are easier to manage and prevent waste.
Buying cereal in bulk can lead to staleness and disappointment. Extra-large boxes may lose crunch and it's easy to tire of it before finishing that much.
Read at Business Insider
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