Nuts

In general, you should try to avoid buying nuts in bulk unless you're the kind of person who munches on them throughout the day. They may be more affordable in bulk, but nuts usually expire within two months.

"The high fat content in nuts (particularly in peanuts, pecans and walnuts) causes them to go rancid rather quickly," says Alejandra Ramos, a home-cooking expert and the creator of the website Always Order Dessert. "If you must buy them in large quantities, remember that roasted nuts last longer than raw ones, and shelled ones last the longest. Light, heat and moisture also affect the quality, and they have the tendency to absorb smells, so always store nuts in the fridge or freezer. This also goes for seeds and nuts like sesame seeds, flaxseeds and pine nuts."