Tuesday, December 06, 2005

Cooked Food is Carcinogenic

"Acrylamide is formed when certain foods, particularly plant-based foods that are rich in carbohydrates and low in protein, are cooked at high temperatures, such as in frying, roasting or baking, generally at temperatures higher than 120 degrees Celsius."

Foods Cooked at High Temperatures Release Toxic Chemical Contributed by Miguel SanchezAcrylamide is formed when certain foods, particularly plant-based foods that are rich in carbohydrates and low in protein, are cooked at high temperatures such as in frying, roasting or baking, generally at temperatures higher that 120 degrees Celsius.

Acrylamide is formed when certain foods, particularly plant-based foods that are rich in carbohydrates and low in protein, are cooked at high temperatures such as in frying, roasting or baking, generally at temperatures higher that 120 degrees Celsius.

A substance that contaminates foods cooked at high temperatures, acrylamide, has been shown to cause cancer in animals, warns a report prepared by a committee of international experts and released by a Joint Expert Committee of the UN Food and Agriculture Organization (FAO) and the World Health Organization (WHO) on Friday. The report calls for continued efforts to reduce acrylamide in food.

The neurotoxicity of acrylamide in humans is known from instances of high occupational and accidental exposure when acrylamide is used in industrial processes in the production of plastics and materials. Studies in animals have also shown that acrylamide causes reproductive problems and cancer.

Frying, Baking at High TemperaturesIn 2002, Swedish studies showed for the first time the unintentional formation of relatively high levels of acrylamide during the frying or baking of potatoes and cereal products (at temperatures higher than 120 °C).

This caused public health concerns, though the health impact of acrylamide levels in foods was uncertain.In the wake of the Swedish study, a special expert consultation was held by FAO and WHO in 2002 to review available data. The experts concluded at that time that a number of additional studies were necessary in order to fully evaluate the toxicity and health impact of acrylamide exposure through foods.Cancer: Most Important Toxic EffectThe Joint FAO/WHO Expert Committee on Food Additives and Contaminants (JECFA) met from February 8-17 to consider the possible health risks associated with acrylamide and five other food contaminants.

The Committee concluded that, on the basis of the tests in animals, cancer was the most important toxic effect of acrylamide and that consumption of foods with this contaminant at current levels of occurrence may be a public health concern.The conclusion was based on a conservative evaluation, according to the committee, which noted that there is still considerable uncertainty about the mechanism of the toxicity of acrylamide, assumptions used to compare the most relevant animal data to the human situation, and extrapolation of the intake assessments.

Time and Temperature Affect LevelsAcrylamide is formed when certain foods, particularly plant-based foods that are rich in carbohydrates and low in protein, are cooked at high temperatures, such as in frying, roasting or baking, generally at temperatures higher than 120 degrees Celsius.The major foods contributing to acrylamide exposure in countries for which data were available are potato chips and crisps, coffee and cereal-based products (pastries and sweet biscuits, breads, rolls and toast).

The amount of acrylamide can vary dramatically in the same foods depending on several factors, including cooking temperature and time. Because of this, JECFA experts said that it was not possible to issue recommendations on how much of any specific food containing the substance is safe to eat.Food Industry Seeking Ways to Lower Levels

JECFA noted that the food industry has reported that it is evaluating means to reduce acrylamide levels in various foods. The Committee recommended that efforts to reduce acrylamide concentrations in foods continue. The experts also cautioned that major changes in food processing methods to reduce the levels of acrylamide would need to be checked for nutritional quality and safety, including microbiological contamination, and the possible formation of other undesirable chemicals. Consumer acceptability also has to be considered.

JECFA finally recommended that acrylamide be re-evaluated when results of ongoing toxicological studies become available. Results from the most relevant long-term studies are expected to be available in two to three years time, and these studies may help in reducing the uncertainty in the current risk assessment.

Preparation of Fried Foods and CoffeeBased on this evaluation, FAO and WHO recommend that efforts to reduce acrylamide levels in foodstuffs should continue. National food safety authorities should urge relevant food industries to work towards improving food preparation technologies that lower significantly the acrylamide content in critical foods, particularly potato chips and crisps (French fries and potato chips, respectively), coffee, pastries, sweet biscuits (cookies), breads, rolls and toasts.Preliminary investigations by industry and other researchers seem to suggest that significant reductions are currently feasible in several foods.

The knowledge gained should help in developing guidance for home-prepared foods.Moreover, the latest information available on acrylamide reinforces general advice on healthy eating. Consumers should continue to eat balanced and varied diets, which include plenty of fruit and vegetables, and to moderate their consumption of fried and fatty foods.

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