The Hidden Dangers of Reused Frying Oil: What You Need to Know Before Eating Fried Food

How many times have you walked into a restaurant, browsed the menu, and ordered a large plate of fries for the table? How often do you munch on fried appetizers — like kibbeh, onion rings, or other deep-fried snacks, while waiting for your main course?

Does the kitchen use fresh oil, or are they reusing the frying oil? If you haven’t asked — maybe you should.

What’s the Problem With Reused Frying Oil?

Reused frying oil is not healthy.
A new study has examined the health effects of repeatedly using cooking oil, especially when frying food at high temperatures.

According to the research, fried foods are not just calorie bombs — they may also pose serious health risks.
Researchers found that repeated use of frying oil (something people do at home, too, often without realizing the risks) can lead to neurological degeneration and even brain damage.

Study Highlights:

The study was conducted on animals and published by the American Society for Biochemistry and Molecular Biology.

“Deep frying at high temperatures has been linked to various metabolic disorders, but there have been no long-term investigations into the harmful effects of consuming repeatedly heated oil,”
wrote Prof. Kathiresan Sanmugam from Tamil Nadu University in India, the lead author of the study.

“To the best of our knowledge, we are the first to report long-term damage: consuming oil that’s been reused for deep frying increases neurological degeneration in the first-generation offspring.”

What Did the Study Find?

In the experiment, rats were divided into groups — some were fed food made with fresh oil, while others received food made with reheated oil.

Those that consumed the reheated oil showed:

• Increased liver inflammation

• Accumulation of toxins in the body

• Signs of systemic damage, including potential risks to brain and nerve function

Bottom Line

Fried food isn’t just about extra calories — it could be increasing your risk of chronic inflammation, liver issues, and even neurological damage if the oil used isn’t fresh.

So next time you’re out to eat, it might be worth asking:

“Do you change the oil regularly?”

And if you’re frying at home — avoid reusing oil multiple times.
Your health is worth the extra effort.

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