“Carcinogens in food are not new. We have known about potential carcinogenic compounds in food for many years.
“Take for example processed meat. We have also associated cooking certain foods at high temperatures and certain cooking methods (such as frying and grilling) with cancer too.
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“[But] more research is needed before we can confirm whether fermented foods are harmful to human health.”
Generally, it appears that moderate amounts of fermented foods may be additive to health, due to other nutrients they contain such as calcium and probiotics in kefir, or fibre and B vitamins found in bread.
Source: Daily Express