Reused Cooking Oil Could Cause Breast Cancer Spread


A recent study conducted by some scientists from the University of Illinois at Urbana-Champaign has shown that reheated cooking oil might trigger cell changes that can promote late-stage breast cancer growth.

Breast cancer occurs when cells in the breast grow out of control and form a tumor. If the cells are capable of invading the surrounding tissue or spreading to other areas of the body, doctors deem the disease to be malignant.  Breast cancer can occur in both men and women, but it's far more common in women.

While there are over 100,000 new cases of cancer in Nigeria annually, American Cancer Society (ACS) estimated that doctors will diagnose around 268,600 new cases of invasive breast cancer in 2019. About one in eight women in the U.S. will develop breast cancer during their lifetime.

Reused Cooking Oil Could Cause Breast Cancer Spread
Reused Cooking Oil Could Cause Breast Cancer Spread

To conduct the experiment, the scientists fed all of the lab mice a low fat diet for a week. Then, they gave some of the mice unheated fresh soybean oil for 16 weeks, while the rest ingested thermally abused oil instead.

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The researchers then tested “thermally abused frying oil,” which is cooking oil that has undergone reheating to high temperatures multiple times, in laboratory mice and found that it increased metastatic breast cancer growth.

They chose to use soybean oil because the restaurant industry commonly uses it for deep frying.

To simulate breast cancer, they injected 4T1 breast cancer cells into a tibia of each mouse. These breast cancer cells are very aggressive and have a high rate of metastasis to multiple distant sites. As a result, they often appear in the lymph nodes, liver, and lungs.

At 20 days after the injection of the tumor cells, there was a notable difference in the rate of metastatic growth between the two groups of mice.

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In the mice who had eaten thermally abused oil, the metastatic growth of the tibia tumors was four times greater than that of the tumors in the mice who consumed the fresh oil.

Lead researcher William G. Helferich, a professor of Food Science and Human Nutrition, noted that there were twice as many lung tumors, which were also more aggressive and invasive than those in the fresh-oil group.

Helferich said:”I just assumed these nodules in the lungs were little clones but they weren't. They'd undergone transformation to become more aggressive, the metastases in the fresh-oil group were there, but they weren't as invasive or aggressive, and the proliferation wasn't as extensive.”

According to the findings reported on MedicalNews today that repeated reheating of cooking oil changes its composition and releases acrolein, which is a toxic and potentially carcinogenic chemical.

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Restaurants and other food outlets often reuse soybean oil multiple times before replacing it with fresh oil in the frying vats.

These factors are what led the researchers to investigate whether thermally abused oil could have any effect on breast cancer growth.

Although the results are preliminary, they added to a knowledge base that will grow deeper as research in this area continues.

Ashley W. Oyirifi, a co-lead author and graduate student said of the study:”We're trying to add to this conversation and help people understand that it might not be just some inherent biological mechanism but a lifestyle factor. If diet provides an opportunity to reduce breast cancer survivors' risk, it offers them agency over their own health”.


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