14 DAY TRIAL // People who gain less protection from cancer by eating broccoli may be able to compensate for the difference in their genetic make-up by eating 'super broccoli', a variety with higher levels of the active plant chemical sulforaphane, or by eating larger portions.
"Eating a few portions of broccoli each week may help to reduce the risk of cancer. Some individuals, who lack a gene called GSTM1, appear to get less cancer protection from broccoli than those who have the gene," lead scientist on the new research, Professor Richard Mithen of the Institute of Food Research (IFR), said
"Our studies suggest that this may be because if you lack the gene you cannot retain any sulforaphane inside your body, it is all excreted within a few hours. However, if you consume larger portions of broccoli, or broccoli with higher levels of sulforaphane, such as the 'super broccoli', you may be able to retain as much sulforaphane in your body as those who have the gene. Eating larger portions may have additional benefits since broccoli is also a rich source of other vitamins and minerals".
Broccoli is the main source of natural compound sulforaphane. It belongs to the crucifer family of plants which includes the brassica vegetables cabbage, cauliflower and Brussels sprouts, and the closely related Chinese cabbage and turnips.
Sulforaphane is the main isothiocyanate derived from broccoli. 'Super broccoli' contains 3.4 times more sulforaphane than standard varieties. It has been developed by traditional plant breeding methods.
Fifty per cent of the population lack the GSTM1 gene. While these people may gain less cancer protection from consuming broccoli, it is likely that they gain more cancer protection from eating other types of crucifers, such as cabbages and Chinese cabbage. So the best advice is to eat a mixture of crucifers.
A previous study carried out by the International Agency for Cancer Research showed that eating cruciferous vegetables at least once a week cuts cancer risk.
But IACR's study said that it applies only to persons who have in their genetic structure two inactive versions of the genes, GSTM1 and GSTT1. They also said that when the two genes are inactive, the isothiocyanates end up playing an important role in the battle with cancer.