Cooking oil do have a shelf life, and the shelf life of cooking oil can change based off how you store the cooking oil and how much oxygen that touches the cooking oil. If you leave the bottle of cooking oil unopened, the cooking oil can last for one or two years if you store the bottle in a cool and dark location. However, once you open the bottle of cooking oil, oxygen in an air can be exposed to the presence of the oil.
As a result, the cooking oil can begin to break down due to an oxidation process. Over time, cooking oil can become rancid due to the oxidation processes. If cooking oil has become rancid, the cooking oil will have a bitter taste to it and will no longer be healthy for the human body.
How to Store Cooking Oil and Tell If It Is Bad
The main factor that determine the shelf life of cooking oil is the storage condition of the oil. Three factors can lead to the spoilage of cooking oil: light, heat, and air. If sunlight exposes cooking oil, the oil can break down due to a process called photo-oxidation.
High temperatures can lead to the cooking oil becoming rancid, so you should never store cooking oil near a stove. The air can also introduce oxygen into the cooking oil, which lead to the development of rancidity. To minimize the amount of oxygen that enter the bottle after opening the bottle, the cooking oil should be stored in a tightly-sealed container.
Additionally, you should also minimize the amount of time that the cooking oil is exposed to air. Not all types of cooking oil have the same shelf life. For example, refined cooking oils, such as peanut oil and avocado oil, have higher stability and will last longer once you open the bottle.
However, cooking oils that is based upon nuts, such as walnut oil and flaxseed oil, are very fragile. These type of oils tend to go bad in a few weeks if they arent stored in the refrigerator. Additionally, not all types of cooking oil have the same smoke point.
The smoke point is the temperature at which cooking oil will begin to burn. Oils with high smoke points, like avocado oil, is best used for frying food. Cooking oils with low smoke points, such as flaxseed oil, are best used for cold uses, like salad dressings.
If cooking oil is heat to its smoke point, acrolein will be created. This chemical can cause irritation in the human stomach. One way to determine if cooking oil has gone bad is by using you’re sense of smell.
Fresh cooking oil will have no smell or will have a smell similar to grass, nuts, or butter. Cooking oil that has gone bad will have a smell similar to crayons, paint thinner, or old fish. Because heat can mask the smell of cooking oil, cooking oil should be smelled while it is cold.
If the cooking oil smell bitter or soapy when tasted, the oil has gone bad and should be thrown away. The type of container in which the cooking oil is stored can also affect its shelf life. Cooking oil stored in dark glass bottles will be protected from the sunlight.
Additionally, you will preserve the antioxidants in the oil if you store the oil in a dark bottle. If cooking oil is stored in a clear container, the light will degrade the quality of the oil. If cooking oil is in a clear bottle, it should be transferred to a dark container or you should wrap the bottle in paper.
If cooking oil becomes rancid, it can be harmful to the human body. When the body consume cooking oil that has gone bad, the fat in the oil becomes oxidized. Oxidized fat create free radicals in the human body.
Free radicals can cause inflammation and cell damage in the body. Additionally, the antioxidants in the oil can dissapear when the oil go bad. Therefore, cooking oil that has gone bad will provide no nutritional benefit to the body.
Additionally, consuming cooking oil that has gone bad can lead to physical discomfort in the body. Consuming rancid cooking oil can cause nausea or stomach cramps. To avoid these health issue, you should of always ensure cooking oil is fresh.