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Is it safe to use cooking oil once used? If so how many times it can be reused?
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Cooking oil can be used over again until it loses characteristics. The only problem is the mixing of scents and favours and most food like fish have strong smell. You can opt to use separate oils for particular dishes, this way you don't have to keep wasting while you change. 
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It is not nutritionally ideal to reuse oil already used. Let's say for example, you have used oil to fry something, you are not expected to reuse that same oil again in cooking another food. This is simply because the oil has lost its nutritional value during that frying process. The reusing of it it's like taking in something that would not add any health benefits to the body but instead the ingestion of harmful chemicals capable of militating against the normal body functioning.
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It is generally not recommended to reuse cooking oil, as it can become rancid, or contaminated with food particles, after being used. It is best to discard the cooking oil after one use, as this will ensure that it is safe to use and will not negatively affect the quality of the food you are cooking.

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Cooking oil can be reused until the dark coloration occurs. It is safe to use nut you should not use the oil with those sediments formed beneath the while cooking. It's said to be harmful to health. Other best option is to use the oil from the top of the container after allowing it to settle for half an hour or so. All these tips are only applicable for frying or roasting the same type of stuff. Otherwise, it may taste bad.
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No. It can spoil fast and you don't want the flavors of the oil to be in another dish you cook. It is best to replace the used oil with fresh every time.

Most fast food places reuse the oil for at least a week even though it needs to be replaced daily or every time something goes in the oil. For example, when placing French fries and chicken nuggets in the oil to be fried, that oil should be replaced each time to avoid mingling flavors. This is why McDonald's, for example, have constantly greasing fries instead of crispy fries.
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Cooking oil can be reused if it is fresh out of the oven and has not been used yet. It should be fresh because it takes time to cook the oil. It should also be unrefrigerated and not openable.
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Seal the jar tightly, label it with the date, and refrigerate or freeze for no longer than a month. It may become cloudy in the refrigerator or freezer, but will clear at room temperature. Never reuse oil if it foamed or changed color during heating, or if it has an odd odor or smells like the food you cooked.
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Cooking oil can be reused as many times as possible. Only when it starts to produce funny odours is when you stop.

The worst part is when people use transformer oil to cook. They say it can last longer than ordinary oil.
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The regular cooking oil can be reused. Nothing wrong in that. But the oil contains flavor and scents of previously cooked food. If you are ok with it, you can reuse it. 
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No, reused oil produces harmful molecules or free radicals which in order to repair themselves, attack and mutilate the healthy cells in our body.

Free radicals are known to cause numerous lifestyles diseases such as heart diseases, hypertension, and premature aging.

Cooking oils heated at high temperatures emit compounds (HNE'S) which have been linked to chronic inflammation, respiratory ailments, cataract, liver problems and even certain cancers.
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It is not advisable to reuse cooking oil. There are some facts that were accumulated once cooking a particular meal. Some experts claimed that it can cause heart or brain attack.  
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Yes, it can be used but some people says its very harmful for human body but everyone know think if we can't used it then what should be done by us for this everyone used it again and again.
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Well you can use it again and their will be no problem for you as untill it lost his characterstics feature you can always use it again
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Health wise it should not be reused. Nutritionally, if you use oil to fry fish for instance, you cannot use it again to stir fro vegetables. Ideally, use correct amount of oil for each cooking to avoid wastage 
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No, cooking oil once used cannot be used again. It will cause cancer in our bodies. heating oil again will create transfat that is dangerous to the health. if needed it can be reused atleast 3 times a day.
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It can be used over and over again but its not recommended . Like if you are cooking some fried chicken , you can fry a bunch of them gain and again in the same oil but , never cook different things in it . That is why fried stuff from hotels are not recommended has very things cooked in the same oil can be very hygienic and they might even reuse it the next day
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No cooking oil should not be reused, it is unhealthy , it increases Cholesterol , creates peroxides acid, causes cancer, attacks organ cells and can infect the white blood cells.

Some people reuse cooking oil to save money , and some restaurants reuse cooking oil to lower expenses which is totally wrong.
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When we talk about cooking, oil is an essential part of it as it is used in so many different ways to enhance the flavour or give food a certain texture.
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Oil with a high smoke point, such as soyabean or corn oil, can be reused up to 8 times. Reusing oil can lead to the generation of free radicals, which can cause inflammation and various chronic diseases.
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The answer depends on the type of cooking oil you are using. In general, it is not recommended to use cooking oil more than once. This is because the oil can start to break down and become impure after one use. Additionally, it can also start to become contaminated with food particles and bacteria, which can make it unsafe to consume. If you decide to reuse the cooking oil, strain and filter it to remove any particles. Additionally, it is important to use a clean container to store the oil to prevent contamination.
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Reusing cooking oil is not recommended due to the accumulation of harmful substances, such as acrolein and fatty acids, which can pose health risks when ingested. Additionally, reusing oil can decrease its smoke point and make it unsuitable for cooking. It's recommended to use fresh oil for each cooking session.
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Reusing cooking oil depends on a few factors, such as the type of oil, the temperature it was used at, and how many times it has already been used.

In general, it's best to avoid reusing oil that has been heated to high temperatures, such as for deep frying, as it can break down and form harmful compounds. Additionally, oil that has been used multiple times may contain harmful compounds and have a rancid taste.

If you do choose to reuse cooking oil, it's recommended to strain it through a fine-mesh sieve or cheesecloth to remove any food particles and debris. You should also store it in a cool, dark place to prevent oxidation and spoilage.

Overall, it's generally safer and healthier to use fresh oil for each cooking session, especially if you're using it for high-temperature cooking.
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Reusing cooking oil is generally not recommended as it can break down and produce harmful compounds when heated multiple times. Additionally, reused oil can impart unwanted flavors to food and may not be as effective in cooking. It is best to use fresh oil for each cooking session.
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