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A list of eight ingredients and food items has been shared in multiple Thai-language social media posts alongside the claim they cause cancer. But the claim is misleading: health experts told AFP that the items have not been proven to be carcinogenic.
“MSG is the number one cancer agent,” reads the Thai-language Facebook post shared here on May 16.
The post claims many Chinese people are diagnosed with cancer, and lists seven items — including various Asian foods — that it claims are carcinogens: chewing gum, pork liver, fermented vegetables, bottled fruit juice, fermented eggs, stinky tofu and fried dough sticks.
“Pass [the list] on to the people you care most about,” the post says.
Screenshot of the misleading Facebook post, taken on June 1, 2022
The same claim was also shared on Facebook here, here and here as well as on the messaging app Line.
“And why was this allowed to be sold? I don’t understand why they would later warn us that it is dangerous. What for? I don’t understand,” one Thai Facebook user wrote in a comment.
“The items mentioned here are all Thai delicacies,” reads another comment.
But the claim is misleading.
Not based on evidence
According to the US Food and Drug Administration, monosodium glutamate (MSG) is “generally recognized as safe”.
It says on its website that although “many people identify themselves as sensitive to MSG, in studies with such individuals given MSG or a placebo, scientists have not been able to consistently trigger reactions”.
Nattha Pipopchaiyasit, head of the Nutrition Science Group at the National Cancer Institute of Thailand, told AFP that “there is no item on this list which, by itself, is proven to be a cause of cancer.”
She added that there are items on the list that should be eaten in moderation.
“MSG can be classified as a type of salt so we must be wary of our sodium intake,” she said. “Consuming too much fried food is not recommended and fermentation can increase the salt content.”
Nicha Zungsontiporn, a lecturer from the oncology division of Chulalongkorn University and The King Chulalongkorn Memorial Hospital, also told AFP that the claim is “not based on scientific evidence”.
But Nicha noted that pickled vegetables are considered a possible carcinogenic agent by the International Agency for Research on Cancer (IARC) — the World Health Organization’s specialised cancer agency.
The IARC measures the strength of evidence to support a substance’s potential for causing cancer, not the probability that cancer will occur.
The agency analysed Asian pickled vegetables in 1993 and found conflicting evidence from several studies on the association between the food and cancer types.
“There is limited evidence in humans for the carcinogenicity of pickled vegetables as prepared traditionally in Asia,” reads the report.
As of June 21, none of the other seven items on the list in the misleading posts appears in the IARC’s database.
Sure and Share, fact checkers with the Thai news agency MCOT, also debunked the claim in November 2020.
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