Whole Grains Linked to Reduced Heart Disease Risk, Major Study Suggests

A daily intake of whole grain foods, equivalent to about two slices of wholegrain bread, is associated with significant health benefits including weight loss, reduced cholesterol levels, and a lower risk of heart attack, a major study has found.

Scientists analyzed data from 87 clinical trials involving over 6,500 participants across Asia, Europe, the US, Canada, and Brazil. The findings, published in the European Heart Journal, indicate that consuming whole grains can positively impact cardiovascular health. Whole grains are foods made from the entire grain kernel, retaining essential nutrients like fiber, B vitamins, iron, zinc, magnesium, healthy unsaturated fats, and phytonutrients, unlike refined grains which undergo processing that removes these components.

The study revealed that consuming just 48 grams of whole grains per day was linked to an average fat loss of approximately 0.2 kilograms (about half a pound) and a reduction in waist size by about 0.22 centimeters. A smaller waist circumference is associated with a reduced risk of type 2 diabetes and certain cancers.

Furthermore, daily whole grain consumption of 48 grams led to a decrease in total cholesterol levels by approximately 0.10 millimoles per liter (mmol/L). This reduction was primarily driven by a drop in low-density lipoprotein (LDL), or "bad" cholesterol, by about 0.07 mmol/L. High levels of LDL cholesterol can lead to fatty deposits in arteries, increasing the risk of heart attack and stroke.

Triglycerides, another type of blood fat that can contribute to heart disease when elevated, also decreased by 0.04 mmol/L. Systolic blood pressure, the pressure exerted on artery walls when the heart beats, dropped by 0.82 millimeters of mercury (mmHg).

The most pronounced improvements were observed in individuals who consumed between 60 and 100 grams of whole grains daily, roughly four slices of wholegrain bread. At this higher intake level, blood pressure reductions were three times greater, and total cholesterol fell by 0.21 mmol/L, LDL cholesterol by 0.16 mmol/L, and triglycerides by 0.08 mmol/L.

Dr. Helda Tutunchi, associate professor in nutritional sciences at Tabriz University of Medical Sciences and lead author of the study, stated that the findings offer a practical guideline for whole grain consumption to improve cardiovascular risk factors. She described increasing whole grain intake as a "simple, accessible and affordable dietary strategy" that can complement other health interventions.