In place of red meat, nonvegetarians might consider poultry and fish. In the study, the largest consumers of “white” meat from poultry and fish had a slight survival advantage. Likewise, those who ate the most fruits and vegetables also tended to live longer.

Image Credit... Yarek Waszul

Anyone who worries about global well-being has yet another reason to consume less red meat. Dr. Popkin, an epidemiologist at the University of North Carolina, said that a reduced dependence on livestock for food could help to save the planet from the ravaging effects of environmental pollution, global warming and the depletion of potable water.

“In the United States,” Dr. Popkin wrote, “livestock production accounts for 55 percent of the erosion process, 37 percent of pesticides applied, 50 percent of antibiotics consumed, and a third of total discharge of nitrogen and phosphorus to surface water.”

Finding a Culprit

A question that arises from observational studies like this one is whether meat is in fact a hazard or whether other factors associated with meat-eating are the real culprits in raising death rates. The subjects in the study who ate the most red meat had other less-than-healthful habits. They were more likely to smoke, weigh more for their height, and consume more calories and more total fat and saturated fat. They also ate less fruits, vegetables and fiber; took fewer vitamin supplements; and were less physically active.

But in analyzing mortality data in relation to meat consumption, the cancer institute researchers carefully controlled for all these and many other factors that could influence death rates. The study data have not yet been analyzed to determine what, if any, life-saving benefits might come from eating more protein from vegetable sources like beans or a completely vegetarian diet.

The results mirror those of several other studies in recent years that have linked a high-meat diet to life-threatening health problems. The earliest studies highlighted the connection between the saturated fats in red meats to higher blood levels of artery-damaging cholesterol and subsequent heart disease, which prompted many people to eat leaner meats and more skinless poultry and fish. Along with other dietary changes, like consuming less dairy fat, this resulted in a nationwide drop in average serum cholesterol levels and contributed to a reduction in coronary death rates.

Elevated blood pressure, another coronary risk factor, has also been shown to be associated with eating more red and processed meat, Dr. Sinha and colleagues reported.