An opened box of cereal will go stale from air exposure after three months, but a sealed box should last up to a year. This can vary if it contains nuts, which are prone to rancidity.
Nuts and seeds have a high amount of oil in them, and that oil will start to go rancid after a couple of months.
Dried herbs are items people store forever, and they shouldn't. The issue is not about food safety, but rather quality, as their intensity and flavor will vanish due to rancidity.
Baking powder and baking soda will lose their leavening power over time, which will result in a sad cake! So make sure your ingredients are fresh before baking.
Typical peanut butter can be kept in the pantry, but if yours is the organic kind, the oils will separate and turn rancid.
Open condiments, like ketchup and mayo, can go bad in just weeks when left unrefrigerated. While refrigerated, ketchup should be consumed within one month if opened.
Heat, air, and moisture are elements that can negatively affect their healthy oils, which causes them to pass their peak.
But the longer they sit on your shelf, the more likely they'll start to break down and get a metallic taste from the can.
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