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A plant-based diet may be key to lowering your risk of heart disease, researchers report.
In a new study, researchers determined that diets with reduced sulfur amino acidswhich occur in protein-rich foods, such as meats, dairy, nuts, and soywere associated with a decreased risk for cardiovascular disease.
The team also found that the average American consumes almost two and a half times more sulfur amino acids than the estimated average requirement.
Amino acids are the building blocks of proteins. A subcategory, called sulfur amino acids, including methionine and cysteine, play various roles in metabolism and health.
For decades it has been understood that diets restricting sulfur amino acids were beneficial for longevity in animals, says John Richie, a professor of public health sciences at the Penn State College of Medicine. This study provides the first epidemiologic evidence that excessive dietary intake of sulfur amino acids may be related to chronic disease outcomes in humans.
Researchers examined the diets and blood biomarkers of more than 11,000 participants from a national study and found that participants who ate foods containing fewer sulfur amino acids tended to have a decreased risk for cardiometabolic disease based on their bloodwork.
The team evaluated data from the Third National Examination and Nutritional Health Survey. They compiled a composite cardiometabolic disease risk score based on the levels of certain biomarkers in participants blood after a 10-16 hour fast including cholesterol, triglycerides, glucose, and insulin.
These biomarkers are indicative of an individuals risk for disease, just as high cholesterol levels are a risk factor for cardiovascular disease, Richie says. Many of these levels can be impacted by a persons longer-term dietary habits leading up to the test.
Researchers excluded participants from the study if they reported having either congestive heart failure, heart attack, or a reported change in diet due to a heart disease diagnosis. They also omitted individuals if they reported a dietary intake of sulfur amino acids below the estimated average requirement of 15 mg/kg/day recommended by the Food and Nutrition Board of the National Academy of Medicine.
For a person weighing 132 pounds, food choices for a day that meet the requirement might include a medium slice of bread, a half an avocado, an egg, a half cup of raw cabbage, six cherry tomatoes, two ounces of chicken breast, a cup of brown rice, three quarters of a cup of zucchini, three tablespoons of butter, a cup of spinach, a medium apple, an eight inch diameter pizza, and a tablespoon of almonds.
Nutritionists collected information about participants diets by doing in-person 24-hour recalls. Then, they calculated nutrient intakes using the US Department of Agriculture Survey Nutrient Database.
After accounting for body weight, the researchers found that average sulfur amino acid intake was almost two and a half times higher than the estimated average requirement. Coauthor Xiang Gao, associate professor and director of the nutritional epidemiology lab, suggested this may be due to trends in the average diet of a person living in the United States.
Many people in the United States consume a diet rich in meat and dairy products and the estimated average requirement is only expected to meet the needs of half of healthy individuals, Gao says. Therefore, it is not surprising that many are surpassing the average requirement when considering these foods contain higher amounts of sulfur amino acids.
The researchers found that higher sulfur amino acid intake associated with a higher composite cardiometabolic risk score after accounting for potential confounders like age, sex, and history of diabetes and hypertension. They also found that high sulfur amino acid intake was associated with every type of food except grains, vegetables, and fruit.
Meats and other high-protein foods are generally higher in sulfur amino acid content, says lead author Zhen Dong, a graduate from the College of Medicine. People who eat lots of plant-based products like fruits and vegetables will consume lower amounts of sulfur amino acids. These results support some of the beneficial health effects observed in those who eat vegan or other plant-based diets.
While this study only evaluated dietary intake and cardiometabolic disease risk factors at one point in time, the association between increased sulfur amino acid intake and risk for cardiometabolic disease was strong, Dong says. The data supports the formation of a prospective, longitudinal study evaluating sulfur amino acid intake and health outcomes over time, she says.
Here we saw an observed association between certain dietary habits and higher levels of blood biomarkers that put a person at risk for cardiometabolic diseases, Richie says. A longitudinal study would allow us to analyze whether people who eat a certain way do end up developing the diseases these biomarkers indicate a risk for.
The study appears in Lancet EClinical Medicine.
The authors declare no conflict of interest or specific financial support for this research.
Source: Penn State
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