Plant-based diets are becoming more popular in many areas of the world, but the health benefits of this dietary pattern may depend largely on the specific foods consumed.
In a new study, researchers found that people following a plant-based diet who frequently consumed less-healthful foods like sweets, refined grains and juice showed no heart health benefit compared with those who did not eat a plant-based diet.
The research was conducted by a team at Harokopio University of Athens, Greece.
In the study, the team tracked eating behavior and the development of heart disease among more than 2,000 Greek adults over a 10-year period, beginning in 2002.
Participants were asked to complete a detailed food frequency survey at the time of enrollment, after five years and after 10 years.
At the end of the study period, the researchers analyzed the relationship between diet and the development of cardiovascular disease using a dietary index that divided participants into three groups based on the number of animal-based foods (which included meats as well as animal-derived products such as eggs and dairy) they consumed per day.
Overall, men eating fewer animal-based foods were 25% less likely to develop heart disease compared to men eating more animal-based foods.
The same overall trend was seen in women, but the relationship was less strong, with an overall risk reduction of about 11% among women eating the fewest animal-based foods.
Even though the difference in heart disease risk was big between these groups, the overall difference in the consumption of animal-based foods was relatively small.
Those following a more plant-based diet consumed, on average, three animal-based foods daily while those following a less plant-based diet consumed five.
These findings highlight that even a small reduction in the daily consumption of animal-based products—principally the less healthy foods, such as processed meat products—accompanied by an increase in healthy plant-based foods may contribute to better cardiovascular health.
Focusing in on participants who followed a more plant-based diet, researchers then categorized each participant’s diet as either healthful (reflecting increased consumption of fruits, vegetables, whole grains, nuts, legumes, oils, and tea or coffee) or unhealthful (reflecting increased consumption of juices, sweetened beverages, refined grains, potatoes, and sweets).
They found only participants following a healthful plant-based diet had a big reduction in heart disease risk compared to those who ate more animal-based products.
Differences in eating patterns—and associated cardiovascular risk reduction—were also observed between women and men.
In general, men ate about three times per day while women tended to snack more, eating four to five times daily.
At the same time, women showed a more dramatic increase in heart disease risk when eating an unhealthful plant-based diet and a more dramatic reduction in risk when eating a healthful plant-based diet compared to men who fell into the same two categories.
This suggests that snacking on healthful foods can be beneficial while snacking on unhealthful foods can bring higher risks.
The lead author of the study is Demosthenes Panagiotakos, Ph.D., a professor of biostatistics.
The study was presented at the American College of Cardiology’s Annual Scientific Session Together with the World Congress of Cardiology (ACC.20/WCC).
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