How risky is eating red meat? New papers provoke controversy

FILE - In this June 5, 2014, file photo, a man makes a submarine sandwich with mortadella, cooked salami, ham, Genoa salami and sweet capicola at a delicatessen in Massachusetts. An international team of researchers is questioning the advice to limit red and processed meats, saying the link to cancer and heart disease is weak. Their conclusions were swiftly attacked by a group of prominent U.S. scientists who tried to stop publication of the research, arguing it sends the wrong message. (AP Photo/Elise Amendola, File) · Associated Press

NEW YORK (AP) — Eating red meat is linked to cancer and heart disease, but are the risks big enough to give up burgers and steak?

A team of international researchers says probably not, contradicting established advice. In a series of papers published Monday, the researchers say the increased risks are small and uncertain and that cutting back likely wouldn't be worth it for people who enjoy meat.

Their conclusions were swiftly attacked by a group of prominent U.S. scientists who took the unusual step of trying to stop publication until their criticisms were addressed.

The new work does not say red meat and processed meats like hot dogs and bacon are healthy or that people should eat more of them. The reviews of past studies generally support the ties to cancer, heart disease and other bad health outcomes. But the authors say the evidence is weak, and that there's not much certainty meat is really the culprit, since other diet and lifestyle factors could be at play.

Most people who understand the magnitude of the risks would say "Thanks very much, but I'm going to keep eating my meat," said co-author Dr. Gordon Guyatt of McMaster University in Canada.

It's the latest example of how divisive nutrition research has become, with its uncertainties leaving the door open for conflicting advice. Critics say findings often aren't backed by strong evidence. Defenders counter that nutrition studies can rarely be conclusive because of the difficulty of measuring the effects of any single food, but that methods have improved.

"What we need to do is look at the weight of evidence — that's what courts of law use," said Dr. Walter Willett, a professor of nutrition at Harvard University who was among those calling for the papers' publication to be postponed.

Willett, who has led studies tying meat to bad health outcomes, also said the reviews do not consider the particularly pronounced benefits of switching from red meat to vegetarian options.

The journal, Annals of Internal Medicine, defended the work and said the request to have it pulled before publication is not how scientific discourse is supposed to happen. Guyatt called the attempt to halt publication "silly."

In the papers, the authors sought to gauge the potential impact of eating less meat, noting the average of two to four servings a week eaten in North America and Western Europe. They said the evidence for cutting back wasn't compelling. For example, they found that cutting three servings of red meat a week would result in seven fewer cancer deaths per 1,000 people.