Red meat: Good or bad for health?

Red meat contains numerous vitamins and minerals that are essential for a healthful, balanced diet. In recent years, however, its reputation has been severely blemished, with studies suggesting that red meat intake can increase the risk of cancer and other diseases. But is it really that bad for us? We investigate.

Red meat is defined as any meat that comes from mammalian muscle. This includes beef, lamb, pork, goat, veal, and mutton.

For many households, red meat is considered a food staple, with some of us consuming beef, lamb, and pork in different variations on a daily basis.

Last year, the average person in the United States is estimated to have consumed around 106.6 pounds of red meat. Although this might appear a high intake, it is a significant reduction from the average 145.8 pounds consumed per capita in 1970.

Over the past 10 years alone, red meat consumption has fallen by around 10 pounds per person, with 2014 seeing the lowest intake of red meat since 1960, at just 101.7 pounds per person.

But why are so many of us cutting down on red meat?

A shift toward plant-based foods

According to a 2016 Harris Poll, approximately 8 million adults in the U.S. are vegetarian or vegan, with concerns about animal welfare being the driving factor.

However, it seems that millions more of us are opting for plant-based foods over meat-based products because we believe that they are more healthful. The 2016 Harris Poll found that 37 percent of U.S. adults "always" or "sometimes" eat vegetarian meals when eating out, with 36 percent of these citing health reasons for their choice.

A number of studies have suggested that when it comes to health, a plant-based diet is the way to go. In December 2016, a position paper from the Academy of Nutrition and Dietetics claimed that a plant-based diet can lower the risk of type 2 diabetes by 62 percent, as well as reduce the risk of heart attack and stroke.

"If you could bottle up a plant-based prescription, it would become a blockbuster drug overnight," commented paper co-author Susan Levin, of the Physicians Committee for Responsible Medicine in Washington, D.C.

It is not only the health benefits associated with plant-based diets that are steering us away from red meat, however, but the health risks that might arise from eating red meat. We take a look at what some of these risks are.

Cancer

When it comes to red meat intake, cancer is perhaps the most well-established health implication.

In October 2015, the World Health Organization (WHO) published a report concluding that red meat is "probably carcinogenic to humans," meaning that there is some evidence that it can increase the risk of cancer.

Additionally, the WHO concluded that processed meats - defined as "meat that has been transformed through salting, curing, fermentation, smoking, or other processes to enhance flavor or improve preservation" - is "carcinogenic to humans," meaning that there is sufficient evidence that processed meat intake increases cancer risk.

To reach these conclusions, the WHO's International Agency for Research on Cancer (IARC) Working Group reviewed more than 800 studies assessing the effects of red and processed meats on various types of cancer.

They found that each 50-gram portion of processed meat - which primarily includes pork or beef - consumed daily increases the risk of colorectal cancer by 18 percent.

The IARC also uncovered evidence of a link between red meat intake and increased risk of colorectal, pancreatic, and prostate cancers.

It is thought that cooking red meats at high temperatures - through frying or barbecuing, for example - is what contributes to an increased cancer risk.

According to the National Cancer Institute - a part of the National Institutes of Health (NIH) - cooking meats at high temperatures can lead to the production of heterocyclic amines (HCAs) and polycyclic aromatic hydrocarbons (PAHs), which are chemicals that have been shown to increase cancer risk in animal models.

However, the report from WHO concluded that the role of HCAs and PAHs in human cancer risk is not fully understood, and from their review, there was not enough data to determine whether the way meat is cooked influences cancer risk.

Kidney failure

Kidney failure - whereby the kidneys are no longer able to filter waste products and water from the blood - is estimated to affect more than 661,000 people in the U.S.

Diabetes and high blood pressure are among the most common causes of kidney failure, but in July 2016, one study suggested that red meat intake might be a risk factor.

Published in the Journal of the American Society of Nephrology, the study reported a dose-dependent link between red meat consumption and risk of kidney failure. For example, participants who were in the highest 25 percent of red meat intake were found to have a 40 percent increased risk of kidney failure, compared with those in the lowest 25 percent.

"Our findings suggest that these individuals can still maintain protein intake but consider switching to plant-based sources; however, if they still choose to eat meat, fish/shellfish and poultry are better alternatives to red meat," says study co-author Dr. Woon-Puay Koh, of the Duke-NUS Medical School in Singapore.

Source: Medical News Today