One Avocado a Day May Lower a Key Heart Disease Risk Factor in People With Obesity

Eating one avocado every day may help reduce a key risk factor for cardiovascular disease in adults with abdominal obesity, according to a new study by researchers at Penn State University, published in the Journal of Clinical Lipidology.

The researchers found that daily avocado consumption reduced the number of low-density lipoprotein (LDL) particles in the bloodstream. Unlike LDL cholesterol alone, the concentration of LDL particles is considered an independent predictor of cardiovascular disease. The observed reduction corresponded to an estimated 4% decrease in heart disease risk.

"If people want to improve the quality of their diet, making one small change may be more realistic than trying to completely overhaul their eating habits," said Janhavi Damani, the study's first author and a postdoctoral scholar at Penn State. "For people with obesity, adding an avocado to their daily diet could be a practical first step."

LDL particles transport cholesterol throughout the body. Researchers explain that two people can have the same LDL cholesterol level but different cardiovascular risks if one has a greater number of smaller LDL particles. These smaller particles are more likely to penetrate the walls of blood vessels, promoting the formation of atherosclerotic plaque.

As plaque accumulates, arteries become narrower and less flexible, increasing blood pressure during physical exertion or stress and raising the likelihood of cardiovascular events such as heart attacks.

The study analyzed data from 786 adults aged 25 and older who participated in the six-month Habitual Diet and Avocado Trial. All participants had abdominal obesity. Half continued their usual diet, while the other half added one avocado per day without making other dietary or lifestyle changes.

Previous results from the trial showed that eating an avocado daily did not lead to weight loss or a reduction in waist circumference but did lower LDL cholesterol levels.

The new analysis demonstrated that participants in the avocado group experienced an average reduction of 49 nanomoles per liter in LDL particle concentration, corresponding to an estimated 4% lower risk of heart disease.

Although the effect was modest compared with the larger benefits associated with improving overall dietary patterns, the researchers say it represents a meaningful step toward better cardiovascular health.

The beneficial effect was observed regardless of participants' age, sex, race, ethnicity, or body mass index, suggesting that adults with abdominal obesity may benefit from incorporating avocados into their diets.

"This study demonstrates that the benefits of avocado consumption can be achieved in everyday life, where people's diets are much less controlled than in clinical feeding studies," said Kristina Petersen, senior author of the study and associate professor of nutritional sciences at Penn State.

The researchers note that people considering dietary changes should consult a physician or registered dietitian for personalized nutritional advice.

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