Impact of Healthy and Unhealthy Plant-Based Diets on Blood Pressure

Understanding Plant-Based Diets

A plant-based diet primarily reduces the intake of animal products, such as meat and dairy, while promoting the consumption of nutrient-rich plant foods. These foods include fruits, vegetables, whole grains, legumes, nuts, and seeds, which are abundant in potassium, vitamins, and unsaturated fatty acids that contribute to maintaining healthy blood pressure levels.

Comparative Studies on Plant-Based Diets

While vegetarian and vegan diets are known to lower blood pressure compared to meat-inclusive diets, research specifically comparing various plant-based diets has been limited. It is important to note that not all plant-based diets are equally healthy, and there is a scarcity of studies exploring the effects of both healthy and unhealthy plant-based diets on blood pressure.

INTERMAP Study Overview

The International Study of Macro/micronutrients and Blood Pressure (INTERMAP) aimed to investigate the relationship between three distinct plant-based diets and blood pressure. This study gathered data from over 4,500 individuals aged 40-59 years across Japan, China, the United States, and the United Kingdom. Researchers utilized the Plant-Based Diet Index (PDI) to evaluate dietary habits, which assigns positive scores to healthy plant-based foods and reverse scores to animal products and unhealthy plant-based foods.

Defining Healthy and Unhealthy Plant-Based Foods

Healthy plant-based foods include legumes, whole grains, vegetables, fruits, and vegetable oils. Conversely, unhealthy plant-based foods encompass desserts, potatoes, fruit juices, high-sugar beverages, sweets, and refined grains. The comparison focused on the overall PDI, healthy PDI, and unhealthy PDI.

Findings on Blood Pressure and Diet Quality

Published in the BMJ Nutrition, Prevention & Health, the study’s findings reveal a clear association: a healthy PDI correlates with lower blood pressure, while an unhealthy PDI has negative effects on blood pressure levels. Most participants in the study consumed a mix of plant-based and animal products, indicating that a healthy plant-based diet does not need to be strictly vegetarian or vegan.

The research highlighted that lower blood pressure is linked to the intake of healthy plant-based foods like whole grains and vegetables, whereas the consumption of unhealthy plant-based items, such as sweetened beverages and refined grains, negatively impacts blood pressure.

Implications for Dietary Recommendations

This study is among the first to directly compare the healthiness of plant-based diets concerning their effects on blood pressure. High blood pressure remains a leading global risk factor for cardiovascular diseases, heart attacks, and strokes. Prior studies have shown that unhealthy diets contribute to more deaths globally than tobacco use, excessive alcohol consumption, unsafe sex, and drug abuse combined.

Increasing the intake of whole grains, vegetables, legumes, nuts, seeds, and fruits could potentially prevent millions of deaths annually. While current dietary guidelines advocate for a more plant-based diet, this study emphasizes the need to consider the nutritional quality of plant-based foods. Reducing unhealthy plant-based products may be just as crucial as minimizing animal product consumption when aiming to achieve healthy blood pressure levels.

Further Reading

– Can blood pressure medications treat mental illnesses?
– Six natural ways to lower blood pressure
– Can high blood pressure cause brain damage?
– How to live healthily and reduce high blood pressure
– Why measure blood pressure in both arms?
– Spices and herbs may help reduce blood pressure, according to a study

References

Aljuraiban, G., Chan, Q., Gibson, R., Stamler, J., Daviglus, M., & Dyer, A. et al. (2020). Association between plant-based diets and blood pressure in the INTERMAP study. BMJ Nutrition, Prevention & Health, bmjnph-2020-000077. https://doi.org/10.1136/bmjnph-2020-000077

Thorley, P. (2020). Plant-based diets shown to lower blood pressure even with limited meat and dairy. Medicalxpress.com. Retrieved 11 August 2020, from https://medicalxpress.com/news/2020-07-plant-based-diets-shown-blood-pressure.html

Viguiliouk, E., Kendall, C., Kahleová, H., Rahelić, D., Salas-Salvadó, J., & Choo, V. et al. (2019). Effect of vegetarian dietary patterns on cardiometabolic risk factors in diabetes: A systematic review and meta-analysis of randomized controlled trials. Clinical Nutrition, 38(3), 1133-1145. https://doi.org/10.1016/j.clnu.2018.05.032