Organic food does not reduce risk of cancer in women

31/3/2014

A diet based on organic food does not change the risk of cancer in women, according to a new study which tracked over 600,000 middle-aged women for a decade.

The research was conducted at the UK's University of Oxford and published in the British Journal of Cancer.

One of the investigators, Tim Key, professor of epidemiology and deputy director of the Cancer Epidemiology Unit at Oxford, says: "In this large study of middle-aged women in the UK we found no evidence that a woman's overall cancer risk was decreased if she generally ate organic food."

In the European Union, the US, Canada, Mexico, Japan and other countries, to produce and market organic food you have to obtain a special license.

The word "organic" and the standards that apply to it are slightly different in various countries, but generally it forbids the use of synthetic pesticides and chemical fertilizers in the production of food.

Outside the organic movement, pesticides are widely used in agriculture, and there are concerns that residues from these get into the food chain and could increase the risk of cancer. But so far, the evidence for this is not strong enough to give any clear answers.

No difference in overall cancer risk between women who did or did not eat organic food

For this latest study, the researchers examined data on 623,080 middle-aged UK women being followed in the Million Women Study, a large national study of UK women's health that is funded by Cancer Research UK and the Medical Research Council.

The investigators asked women whether they ate organic foods, and over a 9-year period, looked at how many developed 16 of the most common types of cancer.

The researchers could find no difference in overall cancer risk when they compared 180,000 women who said they never ate organic food with 45,000 who said they always or usually ate it.

When they looked in more detail at each of the 16 different cancers, the researchers found a slightly higher risk for breast cancer and a lower risk for non-Hodgkin lymphoma in women who said they mostly ate organic food. But they said this result could be due to chance and other factors.

Commentary on increasing evidence

Dr. Claire Knight, health information manager at Cancer Research UK, says the study adds to increasing evidence that eating organic food does not lower the risk of developing cancer, but she suggests people should wash their fruits and vegetables before eating them if they are worried about pesticide residue.

She points out that whether fruit and vegetables are conventionally grown or not, it is important to eat a well-balanced diet rich in fruits and vegetables to reduce cancer risk: "Scientists have estimated that over 9% of cancer cases in the UK may be linked to dietary factors, of which almost 5% are linked to not eating enough fruit and vegetables."

 

Source: Medical News Today: http://www.medicalnewstoday.com/articles/274811.php

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