Why Does the Risk of Heart Disease Increase After Eating Red Meat?

Cardiovascular disease is the leading cause of death in the U.S and around the world. Here are a few tips to improve your heart health.

Highlights:

A link between red meat, gut microbiome pathways and cardiovascular disease has been found
Chemical byproducts of food digestion can increase the risk of cardiovascular disease
Trimethylamine N-oxide (TMAO) produced by gut bacteria to digest red meat may up heart disease risk

Gut microbes produce certain chemicals in the digestive tract after eating red meat, which may up a higher risk of cardiovascular disease, reveals a new research published today in the American Heart Association’s peer-reviewed journal Arteriosclerosis, Thrombosis, and Vascular Biology (ATVB).//

How to Improve Cardiovascular Health?

In the United States and around the world, cardiovascular disease is the leading cause of death. While the risk of developing cardiovascular disease, including heart attack and stroke, increases with age, other risk factors are influenced by lifestyle.

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‘Higher consumption of red meat can increase the risk of developing type 2 diabetes and cardiovascular disease.’

Lifestyle and behaviors that are known to improve cardiovascular health include:

eating healthy foods, especially fruits and vegetables;
regular physical activity;
obtaining sufficient sleep;
maintaining a healthy body weight;
stopping smoking; and
controlling high blood pressure, high cholesterol, and high blood sugar.

“Most of the focus on red meat intake and health has been around dietary saturated fat and blood cholesterol levels,” said co-lead author of the study Meng Wang, Ph.D., a postdoctoral fellow at the Friedman School of Nutrition Science and Policy at Tufts University in Boston. “Based on our findings, novel interventions may be helpful to target the interactions between red meat and the gut microbiome to help us find ways to reduce cardiovascular risk.”

How Does Red Meat Affect Gut Microbiome?

Previous research has found that certain metabolites — chemical byproducts of food digestion — are associated with a greater risk of cardiovascular disease. One of these metabolites is trimethylamine N-oxide (TMAO), which is produced by gut bacteria to digest red meat that contains high amounts of the chemical L-carnitine.

High blood levels of TMAO in humans may be associated with higher risks of CVD, chronic kidney disease, and Type 2 diabetes. However, whether TMAO and related metabolites derived from L-carnitine may help explain the effects of red meat intake on cardiovascular risk, and to what extent they may contribute to the cardiovascular risk associated with meat consumption, is still unknown.

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To understand these questions, the researchers conducting this study measured levels of the metabolites in blood samples. They also examined whether blood sugar, inflammation, blood pressure, and blood cholesterol may account for the elevated cardiovascular risk associated with red meat consumption.

Details of the Study

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Study participants included nearly 4,000 of the 5,888 adults initially recruited from 1989 to 1990 for the Cardiovascular Health Study (CHS). The participants selected for the current study were free of clinical cardiovascular disease at the time of enrolment in the CHS, an observational study of risk factors for cardiovascular disease in adults aged 65 or older.

The CHS follows 5,888 participants recruited from four communities: Sacramento, California; Hagerstown, Maryland; Winston-Salem, North Carolina; and Pittsburgh, Pennsylvania. The average age of participants at enrollment was 73, nearly two-thirds of participants were female and 88% of participants self-identified as white. The median follow-up time for participants was 12.5 years, and up to 26 years in some cases. At the follow-up appointment, participants’ medical history, lifestyle, health conditions, and sociodemographic characteristics — such as household income, education, and age — were assessed.

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Several blood biomarkers were measured at the start of the study and again in 1996-1997. The fasting blood samples stored frozen at -80 ˚C were tested for levels of several gut-microbiome linked to red meat consumption including TMAO, gamma-butyrobetaine, and crotonobetaine.

Additionally, all study participants answered two validated food-frequency questionnaires about their usual dietary habits, including intake of red meat, processed meat, fish, poultry, and eggs, at the start of the study and again from 1995 to 1996. For the first questionnaire, participants indicated how often, on average in the previous 12 months, they had eaten given amounts of various foods, ranging from ‘never’ to ‘almost every day or at least five times per week,’ based on medium portion sizes, which varied based on the food source. The second questionnaire used a ten-category frequency of average intake over the past 12 months, ranging from ‘never or less than once per month’ to ‘six+ servings per day,’ with defined standard portion sizes.

Results of the Study

For the current analyses, the researchers compared the risk of cardiovascular disease among participants who ate different amounts of animal source foods (i.e., red meat, processed meat, fish, chicken, and eggs). They found that eating more meat, especially red meat and processed meat, was linked to a higher risk of atherosclerotic cardiovascular disease - a 22% higher risk for about every 1.1 servings per day.

According to the authors, the increase in TMAO and related metabolites found in the blood explained roughly one-tenth of this elevated risk. They also noted that blood sugar and general inflammation pathways may help explain the links between red meat intake and cardiovascular disease.

Blood sugar and inflammation also appear to be more important in linking red meat intake and cardiovascular disease than pathways related to blood cholesterol or blood pressure. Intake of fish, poultry, and eggs was not significantly linked to a higher risk of cardiovascular disease.

“Research efforts are needed to better understand the potential health effects of L-carnitine and other substances in red meat such as heme iron, which has been associated with Type 2 diabetes, rather than just focusing on saturated fat,” Wang said.

Limitations of the Study

The study had several limitations that may have affected its results. The study was observational, meaning it could not control for all risk factors for cardiovascular disease, and may not prove the cause and effect between meat consumption and cardiovascular disease or its mediation by gut microbe-generated chemicals. Additionally, food consumption was self-reported, so errors in reporting were possible. And, as most of the study participants were older, white men and women in the United States, the findings may not apply to populations that are younger or more racially diverse.

Source-Eurekalert