Diet rich in meat and animal products as bad as smoking
Washington: A new study has revealed that smoking, diets rich in animal products, and alcohol have the strongest correlations with cancer incidence rates.
This study is an ecological study in which incidence rates for the various types of cancer for males and females from 87 countries with high quality cancer incidence rate data as well as all 157 countries with cancer incidence rate data were compared statistically with indices for various risk modifying factors.
Dietary supply data were obtained from the Food and Agriculture Organization of the United Nations. Data for various periods back to 1980 were included since there is generally a lag of up to 20 years between dietary changes and peak cancer rates.
The animal products index includes meat , milk, fish, and eggs. Lung cancer incidence rates were used as an index for the effects of smoking and air pollution.
This index integrates the effect of all factors contributing to lung cancer and other cancers linked to lifetime smoking and is a much better index than a snapshot of smoking rates. Latitude was used as an index of solar ultraviolet-B irradiance and vitamin D production.
For the 87 countries with high quality cancer data, the smoking and animal products indices explained over half of the cancer incidence rates, with alcoholic beverage supply explaining a smaller amount.
For males, the smoking index was twice as important as the animal product index, while for females, the animal product index was twice as important.
The types of cancer for which animal products had the strongest correlation include female breast, corpus uteri, kidney, ovarian, pancreatic, prostate, testicular, thyroid cancer, and multiple myeloma.
The reason why animal products increase the risk of cancer is most likely since animal products promote growth of the body as well as tumours through production of insulin-like growth factor-I (IGF-I).
Alcoholic beverage supply was found significantly correlated with only one type of cancer, colorectal. Lung cancer was associated with animal fat supply in addition to cigarette supply.
The study is published in journal Nutrients.
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