An influential study by the University of Guelph, in Canada, published in the Food Research International magazine, has scientifically proved what had been surmised for a long time: red onions are a powerful weapon against cancer. In particular, by comparison with the other varieties, they are the most effective in killing colorectal cancerous cells, and those which cause breast cancer.
A research in Ontario (Canada) studied different types of onion and discovered that the red variety, thanks to the high content of quercetin (an anti-oxidant flavonoid) and of anthocyanins, further increases the anticancer activity.
“Onions activate paths which encourage tumour cells to die. They encourage an unfavourable environment for cancerous cells and disturb cell-to-cell communication, which inhibits their growth”.
This is explained by Abdulmonem Murayyan, one of the researchers. The study was carried out by placing the cancer cell directly in contact with the quercetin extract. The next step will be tests on humans and then, in a near future, the pharmacological use of quercetin taken in pills.