What are the health benefits of hazelnuts?

Hazelnuts are a nutrient-dense nut that can be easily added to meals or enjoyed as a simple snack. One of their key nutritional components is dietary fiber, which plays an important role in digestive health.

Eating enough fiber supports regular bowel function and helps reduce the risk of constipation. In the United States, dietary guidelines suggest that women aged 31–50 should consume about 25.2 grams of fiber daily, while men in the same age group should aim for around 30.8 grams.

A standard 28-gram portion of hazelnuts provides roughly 2.7 grams of fiber, contributing meaningfully to daily intake.

1. Supporting Healthy Digestion

Because hazelnuts contain fiber, they can help promote smoother digestion and more consistent bowel movements. Including them in the diet may support overall gut regularity.

2. May Help Prevent Excess Weight Gain

Recent studies suggest that nut consumption may be associated with a lower risk of weight gain in some individuals.

A 2018 study observed that people who regularly ate nuts tended to gain less weight and had a reduced likelihood of obesity compared to those who rarely consumed them. However, this relationship is correlational, and more research is needed to confirm a direct cause-and-effect link.

3. Protecting Cells from Damage

Hazelnuts are rich in antioxidants, which help protect the body’s cells from oxidative stress caused by free radicals. These compounds help reduce cellular damage over time.

They are particularly high in vitamin E, an antioxidant that may help protect against certain types of cell damage that have been linked to serious diseases, including cancer.

4. May Help Lower Cholesterol

Research suggests that including hazelnuts in the diet may help reduce cholesterol levels.

A 2013 study found that participants who consumed a hazelnut-rich diet experienced reductions in LDL (low-density lipoprotein), often referred to as “bad” cholesterol. Lower LDL levels are associated with a reduced risk of heart disease.

A 2016 review also supported these findings, noting improvements in cholesterol levels without significant weight gain, even though hazelnuts are calorie-dense.

5. May Improve Insulin Response

Some research indicates that nut consumption, including hazelnuts, may improve insulin sensitivity.

In a 2011 study, participants who consumed a mixed nut portion containing hazelnuts daily showed improved insulin sensitivity after 12 weeks. Better insulin response may help lower the risk of type 2 diabetes.

6. Supports Cardiovascular Health

Hazelnuts may contribute to better heart health by improving key cardiovascular risk markers.

A 2013 study found that a diet rich in hazelnuts was associated with improvements in indicators linked to heart disease risk, suggesting a protective effect on the cardiovascular system.

7. May Influence Inflammation Levels

Some studies suggest hazelnuts may help reduce inflammation in the body.

One 2013 study observed decreased inflammatory markers in participants who followed a hazelnut-rich diet. However, other research found little or no significant change, meaning more studies are needed to draw firm conclusions.

8. May Support Male Reproductive Health

Emerging research suggests that regular nut consumption, including hazelnuts, may improve sperm quality and increase sperm count.

However, these findings are based on small studies involving healthy individuals, and more research is required to determine whether the effects apply more broadly.

How to Include Hazelnuts in Your Diet

Hazelnuts can be eaten on their own as a snack or added to salads, baked goods, and other dishes. Ground hazelnuts can also be used as an ingredient in recipes.

It is important to be cautious with commercial hazelnut spreads, as many contain high levels of added sugar.

Precautions and Considerations

Nut allergies are common, and hazelnuts are among the potential allergens. Always check for allergies before serving them to others.

Although hazelnuts are healthy, they are also calorie-dense. It is important to consume them in moderation as part of a balanced diet, since excess intake can lead to unwanted weight gain.