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Red meat linked with increased risk of mortality, suggests study

3 commentsBy Nathan Gray , 13-Mar-2012
Last updated on 13-Mar-2012 at 15:05 GMT

Consumption of high amounts of red meat could be linked with an increased risk of all-cause death, including death from heart disease and cancer, warn researchers.

The study – published in JAMA’s Archives of Internal Medicine – report that intake of red meat is associated with increases in all-cause mortality, and specifically increases the risk of death from cardiovascular disease and cancers. The authors add that substituting other sources of protein such as fish, nuts, and poultry for red meat was found to lower the risks.

"We found that a higher intake of red meat was associated with a significantly elevated risk of total, CVD and cancer mortality, and this association was observed for unprocessed and processed red meat, with a relatively greater risk for processed red meat," wrote the authors, led by An Pan of the Harvard School of Public Health, USA.

"We estimated that 9.3 percent in men and 7.6 percent in women of total deaths during follow-up could be prevented if all the participants consumed fewer than 0.5 servings per day of total red meat in these cohorts," they commented.

"Our study adds more evidence to the health risks of eating high amounts of red meat, which has been associated with type 2 diabetes, coronary heart disease, stroke, and certain cancers in other studies," Pan added.

Study details

Pan and her colleagues analysed data from two prospective cohort studies, containing data from 37,698 men and 83,644 women. All participants were free of cardiovascular disease (CVD) and cancer at baseline. Diets were assessed through questionnaires every four years, said the authors.

A combined 23,926 deaths were documented in the two studies – of which 5,910 were from CVD and 9,464 from cancer, said the authors.

Regular consumption of red meat, particularly processed red meat, was found to be associated with increased mortality risk: one daily serving of unprocessed red meat was associated with a 13% increased risk of mortality, whilst one daily serving of processed red meat was associated with a 20% increased risk.

When looking at specific causes of death, the authors said the corresponding risks were 18% (unprocessed) and 21% (processed) for cardiovascular mortality, and 10% and 16% for death from cancer.

Pan and her colleagues said the analyses took into account chronic disease risk factors such as age, body mass index, physical activity, family history of heart disease, or major cancers.

Red meat risk

The research team noted that red meat, especially processed meat, contains ingredients that have been linked to increased risk of chronic diseases, including cardiovascular disease and cancer. These ingredients include heme iron, saturated fat, sodium, nitrites, and certain carcinogens that are formed during cooking.

They explained that replacing one serving of red meat with one serving of a ‘healthy’ protein source was found to be associated with a lower mortality risk: 7% for fish, 14% for poultry, 19% for nuts, 10% for legumes, 10% for low-fat dairy products, and 14% for whole grains.

Professor Frank Hu of Harvard School of Public Health – and senior author of the paper – commented that the findings provide “clear evidence that regular consumption of red meat, especially processed meat, contributes substantially to premature death."

"On the other hand, choosing more healthful sources of protein in place of red meat can confer significant health benefits by reducing chronic disease morbidity and mortality," said Hu.

 

Source: Archives of Internal Medicine
Published online ahead of print, doi:10.1001/archinternmed.2011.2287
“Red Meat Consumption and Mortality: Results From 2 Prospective Cohort Studies”
Authors: A. Pan, Q. Sun, A.M. Bernstein, M.B. Schulze, J.E. Manson, et al

3 comments (Comments are now closed)

the continuing saga of the epidemiological fallacy

This is a study?? Once in four years a questionnaire about food habits?? Eating what?? Another study just released indicated that poly-unsaturated fats in confined animals can be as much as 35%, whereas grass fed contains mainly fully saturated and mono-unsaturated. Both healthy. The meat used in this "study" was most likely beeflot meat. The scourge of the day.

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Posted by James
15 March 2012 | 03h59

Summary of critique of study.

In summary

There are numerous key problems with this study – I’ll share seven:

1) This study can at best suggest an observed relationship, or association. To make allegations about causation and risk is ignorant and erroneous.

2) The numbers are very small. The overall risk of dying was not even one person in a hundred over a 28 year study. If the death rate is very small, a possible slightly higher death rate in certain circumstances is still very small. It does not warrant a scare-tactic, 13% greater risk of dying headline – this is ‘science’ at its worst.


http://www.zoeharcombe.com/2012/03/red-meat-mortality-the-usual-bad-science/

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Posted by Bill Davis
13 March 2012 | 20h25

Red meat consumption and mortality

Another report aamong numerous others confirming the health risks of eating both unprocessed and processed red meat, presumably not limited to beef. A veggie focused diet has been advocated and proven far healthier in the books of Drs Esselstyn and Campbell, especially the largest ever health study in the book The China Study. The easily absorbed iron in red meat may well be the major cause of age dependent iron over loads in males and in females after age 50 causing a huge rise in in toxic iron body loads as plasma ferritin. The best fix is periodic blood donations to lower and safer ferritin levels.

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Posted by Herman Rutner
13 March 2012 | 17h13

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