Here are 10 science-backed benefits of eating pistachio nuts.

Research suggests that people have been eating pistachios for thousands of years. People consume them today in a variety of dishes from salads to ice creams.

Pistachios are a type of tree nut with numerous health benefits. Pistachios are an excellent source of protein, antioxidants, and fiber.

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According to science, pistachios are:

1. Rich in nutrients

Share on Pinterest Pistachios are nutritionally rich.

Pistachios contain many important nutrients.

According to the United States Department of Agriculture (USDA), 1 ounce or approximately 49 kernels of unroasted nuts contain:

Calories: 159

Protein: 5.72 grams (g)

Fat: 12.85 g

Carbohydrates: 7.70 g

Fiber: 3.00 g

Sugars: 2.17 g

Magnesium: 34 milligrams (mg)

Potassium: 291 mg

Phosphorus: 139 mg

Vitamin B-6: 0.482 mg

Thiamin: 0.247 mg

A serving of pistachios provides about 37 percent of the recommended daily vitamin B-6 intake or 1.3 mg for adults.

Vitamin B-6 plays a vital role in the body, particularly in relation to protein metabolism and cognitive development.

2. Low in calories

Pistachios are one of the lowest calorie nuts, which means people can enjoy the health benefits of nuts while more easily staying within their daily calorie limits.

One ounce of macadamia nuts, for example, contains 204 calories, while 1 ounce of pecans provides 196 calories. The same 1 ounce of pistachios contains just 159 calories.

3. Packed with antioxidants

Antioxidants are substances that play a critical role in health. They reduce the risk of cancer and other diseases by preventing damage to the body’s cells.

Nuts and seeds contain several antioxidant compounds, but pistachios may have higher levels of some antioxidants than other nuts.

Research reports that pistachios have among the highest levels of antioxidants including:

γ-tocopherol

phytosterols

xanthophyll carotenoids

These substances have high antioxidant and anti-inflammatory effects.

In one small study involving 28 participants with high cholesterol who ate 1 or 2 daily servings of pistachios over 4 weeks, researchers showed that they experienced an increase in their levels of the antioxidants lutein, α-carotene, and β-carotene compared to those who ate none.

4. Good for eye health

Share on Pinterest Pistachios may help reduce the risk of eye conditions.

The antioxidants lutein and zeaxanthin are essential for eye health. Pistachios are a rich source of both of these substances.

According to the American Optometric Association, lutein and zeaxanthin reduce the chances of developing eye conditions, including age-related macular degeneration (AMD) and cataracts.

AMD and cataracts are the leading causes of blindness in the United States.

Eating a healthful diet, including pistachios, is a promising way to help prevent these eye diseases from developing.

5. Beneficial for gut health

All nuts are rich in fiber, which encourages a healthy digestive system by moving food through the gut and preventing constipation.

A type of fiber called prebiotics may also feed the good bacteria in the gut. Feeding the good bacteria helps them multiply and “crowd out” harmful bacteria.

According to a small, 2012 study, eating pistachios may increase the levels of beneficial bacteria in the gut. In the study, volunteers ate a standard diet with either 0 ounces, 1.5 ounces, or 3 ounces of pistachios or almonds.

Researchers collected stool samples and found that people who ate up to 3 ounces of pistachios daily showed an increase in potentially helpful gut bacteria, much more so than those who ate almonds.

6. High in protein for vegans and vegetarians

Pistachios contribute to a person’s daily protein needs, at almost 6 g of protein per 1 ounce serving.

Protein accounts for approximately 21 percent of the total weight of the nut, making it a good source for vegetarians and vegans, among others.

Pistachios also boast a higher ratio of essential amino acids, the building blocks of protein, when compared with other nuts, including almonds, hazelnuts, pecans, and walnuts.

7. Helpful for weight loss

Regularly eating nuts helps to reduce the risk of weight gain. Pistachios may be especially beneficial for those who wish to lose weight or maintain their weight thanks to their caloric values and fiber and protein content.

In a 2012 study, people who ate 1.87 ounces of pistachios over a 12-week period experienced twice the reduction in their body mass index (BMI) as people who ate pretzels instead of pistachios. Both groups consumed roughly the same amount of calories.

Having to shell pistachios before eating them may also aid weight loss. Research suggests that seeing the shells provides a visual reminder of how much people have eaten.

8. Important for heart health

Share on Pinterest Pistachios may help reduce cholesterol levels.

Women who frequently eat nuts may enjoy modest protection from cardiovascular disease, according to a 12-year study published in 2001 based on the Iowa Women’s Health Study.

The study also showed a small link between regularly eating nuts and reduced risk of death from other causes.

Pistachios, in particular, may protect the heart by reducing cholesterol levels and high blood pressure.

Research on a small sample of 28 participants that looks specifically at pistachios for heart health, reports that two portions daily reduces the risk of cardiovascular disease. Another study suggests that pistachios may help reduce levels of harmful cholesterol.

A 2015 analysis of 21 studies reports that eating nuts may lead to a significant reduction in blood pressure in people without type 2 diabetes. Pistachios had the strongest effect of all the nuts tested on reducing both systolic and diastolic blood pressure.

9. Good for blood sugar balance

Pistachios have a low glycemic index, so they do not cause a sharp rise in blood sugar after someone has eaten them.

In a small study of 10 people, eating pistachios reduced high blood sugar when eaten with a carbohydrate-rich meal, such as white bread. The researchers suggest that this is one of the ways that nuts lower the risk of diabetes.

For people with diabetes, another study suggests that eating pistachios as a snack is beneficial for blood sugar levels, blood pressure, obesity, and inflammation markers.

10. Reduce colon cancer risk

Pistachios may reduce the risk of some cancers, such as colon cancer, due to their high fiber content.

Scientists demonstrated this in 2017 research that showed that roasting the nuts did not affect their health benefits in relation to colon cancer cells.