of isothiocyanates, phytonutrients that seem to have a strong anti-cancer effect. They are a more bioavailable form of glucosinolates, which also have been shown to have anti-cancer effects. The research conducted at Lyons takes the knowledge a step further.

Studies have shown that isothiocyanates neutralize cancerous cells by inhibiting cell proliferation. The cycle of a normal cell in the body proceeds from cell division, through specialization, and eventually, when the cell has either become damaged or has finished doing its job, to apoptosis - or cell death. The problem with cancer cells is that they don't go through apoptosis. For some reason, their mutations make them resistant to the message that it's time to die. Isothiocyanates appear to be a catalyst that triggers apoptosis. In laboratory experiments, they've induced apoptosis in a number of cell lines. They also seem to slow proliferation of a number of types of cancer cells, including lung cancer lines.

The researchers at Lyons found that there is also a correlation between genetics and the preventive effect of cruciferous vegetables. There are two genes that produce an enzyme that remove isothiocyanates from the body. The Lyons study correlated the results from a

diet questionnaire with blood tests to determine whether those studied had inactive or active forms of those genes. They found that in people who had an inactive form of one of the two genes had a 37% lower risk of developing lung cancer. Those with an inactive form of the other had a 33% lower risk of developing lung cancer. In those with both genes inactive, there was a 72% reduction in lung cancer risk. In those who had two active gene types, there was no difference in risk at all.

Said Paul Brennan, lead author of the research letter, "...this indicates that there is a specific protective effect against lung cancer from cruciferous vegetables."

Random trials to absolutely confirm the findings would be expensive and time consuming, Brennan notes. In the meantime, though, including cabbage, kale, Brussels sprouts, broccoli or turnips in your diet at least once a week may help reduce your risk of developing lung cancer.

About the author:

Ms. Boulay writes for Medopedia.com, which has information on insomnia treatments and sleep apnea treatments.