Low-density lipoprotein (LDL) cholesterol, commonly known as ‘bad cholesterol’, is a well-established risk factor for cardiovascular disease.
In the bloodstream, LDL cholesterol travels inside complexes of lipids and proteins known as LDL particles, which can vary in size and number. For example, people can have the same LDL cholesterol level, but carry it in a larger number of smaller particles.
Studies suggest that small dense LDL particles may carry greater potential health risks, as they are more likely to enter artery walls, where they contribute to plaque formation and increase the risk of cardiovascular disease. Individuals with abdominal obesity often have higher concentrations of small, dense LDL particles, making this marker particularly relevant for assessing cardiovascular risk.
Now, research suggests that eating one avocado a day could help lower levels of these LDL particles in adults with obesity.
Published in the Journal of Clinical Lipidology, the study found that people who consumed 1 avocado per day for 6 months experienced a reduction in LDL particles, which could translate into an approximately 4% lower risk of heart disease.
While the benefits appear modest, the findings suggest that a simple dietary change may improve cardiovascular health.
The analysis used data from the Habitual Diet and Avocado Trial, which included 786 adults aged 25 years and older with abdominal obesity. Eligible males in the study had a waist circumference greater than 40 inches, and eligible females had a waist circumference greater than 35 inches.
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Participants were randomly assigned to one of two groups. One group continued their usual dietary plan and lifestyle, while the other added one avocado each day without making any additional dietary or lifestyle changes.
Adding a daily avocado to the eating plan did not change weight or waist circumference, but did change LDL levels.
Blood samples collected at the beginning and end of the 6-month study showed that participants in the avocado group reduced their LDL particle concentrations by an average of 49 nanomoles per liter compared with those following their usual diet.
Lead author Janhavi Damani, MS, PhD, a postdoctoral scholar in nutritional sciences at Penn State, explained to Medical News Today how avocados may influence LDL particle levels.
“Avocados contain several nutrients that have been linked to better heart and metabolic health, including monounsaturated fats, dietary fiber, and phytosterols. A single avocado provides about 9 grams of fiber and naturally occurring phytosterols, which are likely responsible for the LDL particle reduction observed.”
— Janhavi Damani, MS, PhD
Michelle Routhenstein, MS, RD, CDCES, CDN, a preventive cardiology dietitian and owner of Entirely Nourished, who was not involved in the study, also noted that avocados have many properties that may work synergistically to support heart health, such as supporting healthy cholesterol levels, reducing inflammation and oxidative stress, promoting healthy blood pressure, and improving overall diet quality.
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“Emerging research suggests avocados may help improve LDL particle profiles through several mechanisms. When we replace saturated fats, like butter, with avocados, which are rich in monounsaturated fats, we help reduce the liver’s production of small, dense LDL particles, which are more strongly associated with plaque buildup,” she told MNT.
“Avocados are also rich in soluble fiber and naturally occurring phytosterols, which help reduce cholesterol absorption in the intestine, while their antioxidants, like vitamin E and polyphenols, may help protect LDL from oxidation,” she added.
The researchers estimate that this change corresponds to a 4% reduction in heart disease risk.
Kristina Petersen, PhD, APD, associate professor of nutritional sciences at Penn State and senior author of this study, noted how clinically meaningful incorporating one avocado into a daily eating plan could be:
“Four percent is a modest reduction compared with the 14–29% lower heart disease risk that has been associated with improving the entire diet. While improving the overall diet is likely to have a greater impact on heart health, identifying small, feasible dietary changes may help people make sustainable improvements over time.”
— Kristina Petersen, PhD, APD
The researchers also found that the improvement occurred regardless of participants’ age, sex, race, ethnicity, or body mass index.
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As such, the findings add to growing evidence that incorporating nutrient-rich foods into everyday eating habits may improve cardiovascular health without requiring a complete dietary overhaul.
“The main takeaway is that a small, achievable dietary change may have measurable benefits for heart and metabolic health,” Damani emphasized to MNT.
“In our study, adding one avocado per day to the habitual diet reduced LDL particle concentration in adults with abdominal obesity, suggesting that simple dietary modifications can contribute to cardiovascular health.”
— Janhavi Damani, MS, PhD
The findings suggest that introducing a single healthy food into the eating plan may still provide health benefits and be more achievable for many people, rather than attempting a complete dietary transformation.
Although the reduction in cardiovascular risk is relatively modest compared with the benefits of improving overall diet quality, such as adhering to the American Heart Association (AHA)’s dietary guidance, it still represents a meaningful step in the right direction.
Other analyses from the same clinical trial have shown that eating an avocado each day can improve overall diet quality, red blood cell fatty acid composition, and the gut microbiome. However, it does not appear to affect body weight or waist circumference.
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The authors caution that eating an avocado each day should not be viewed as a standalone strategy for preventing heart disease. Instead, they suggest that avocados can form part of an overall heart-healthy dietary pattern.
“Our findings suggest that incorporating an avocado into the daily diet may be one simple way to improve a cardiovascular risk factor in people with abdominal obesity,” Petersen added.
“However, heart health is influenced by many lifestyle factors, including overall dietary patterns and physical activity. We previously found that the participants who had an avocado per day significantly increased their overall diet quality. This suggests that strategies, like eating one avocado per day, can help people follow dietary guidelines.”
— Kristina Petersen, PhD, APD
For those seeking personalized guidance, it is advisable to consult a healthcare professional or registered dietitian before making significant dietary changes, particularly for people managing cardiovascular disease or other chronic health conditions.
“The key is to think of avocado as a replacement for less heart-healthy ingredients, not simply an addition to the diet,” Michelle Routhenstein, MS, RD, said.
“For example, spread mashed avocado on whole-grain toast instead of butter or cream cheese, use it in sandwiches in place of mayonnaise, or add slices to salads, grain bowls, tacos, or soups instead of cheese or creamy dressings,” she added.
Although the results are promising, they may not be generalizable. The study included only adults with abdominal obesity, so the findings may not apply to people without obesity or to other populations.
In addition, while researchers observed improvements in LDL particle levels, the study did not directly measure whether participants experienced fewer cardiovascular events, such as heart attacks or strokes.
Instead, the estimated reduction in heart disease risk was based on established relationships between LDL particle concentrations and cardiovascular outcomes.
It is also important to note that the research was also supported by the Avocado Nutrition Center, a research organization that funds and compiles scientific studies exploring the health benefits of avocados.
Still, the findings suggest that a relatively simple dietary change, such as adding one avocado a day, may modestly improve an important marker of cardiovascular risk in adults with obesity.
However, no single food can prevent heart disease. Alongside healthy eating patterns and cholesterol management, it is also essential to engage in regular physical activity, maintain a healthy body weight, quit smoking, and manage blood pressure to reduce cardiovascular risk over the long term.
