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Pistachio nuts are not only tasty and fun to eat but also super healthy.
These edible seeds of the Pistacia vera tree contain healthy fats and are a good source of protein, fiber, and antioxidants.
Whats more, they contain several essential nutrients and can aid weight loss and heart and gut health.
1. Loaded with nutrients
Pistachios are very nutritious, with a *-ounce (**-gram) serving of about *9 pistachios containing the following:
Calories: **9
Carbs: 8 grams
Fiber: 3 grams
Protein: 6 grams
Fat: *3 grams (*0% are unsaturated fats)
Potassium: 6% of the Reference Daily Intake (RDI)
Phosphorus: *1% of the RDI
Vitamin B6: *8% of the RDI
Thiamine: *1% of the RDI
Copper: *1% of the RDI
Manganese: *5% of the RDI
Notably, pistachios are one of the most vitamin B*-rich foods around.
Vitamin B6 is important for several bodily functions, including blood sugar regulation and the formation of hemoglobin, a molecule that carries oxygen in red blood cells.

2. High in antioxidants
Antioxidants are vital to your health.
They prevent cell damage and play a key role in reducing the risk of disease, such as cancer.
Pistachios contain more antioxidants than most other nuts and seeds. In fact, only walnuts and pecans contain more.
In one *-week study, participants who ate either one or two servings of pistachios per day had greater levels of lutein and γ-Tocopherol, compared with participants who did not eat pistachios.
Among nuts, pistachios have the highest content of lutein and zeaxanthin, both of which are very important antioxidants for eye health.
They protect your eyes from damage caused by blue light and age-related macular degeneration, a condition in which your central vision is impaired or lost.

3. Low in calories yet high in protein
While eating nuts has many health benefits, they're typically high in calories.
Fortunately, pistachios are among the lowest-calorie nuts.
One ounce (*8 grams) of pistachios contains **9 calories, compared with **5 calories in walnuts and **3 calories in pecans. 
With protein comprising about *0% of their weight, pistachios are second only to almonds when it comes to protein content.
They also have a higher ratio of essential amino acids ⁠the building blocks of protein ⁠than any other nut.
These amino acids are considered essential because your body cannot make them, so you must obtain them from your diet.
Meanwhile, other amino acids are considered semi-essential, meaning that they can be essential under certain circumstances, depending on the health of the individual.
One of these semi-essential amino acids is L-arginine, which accounts for 2% of the amino acids in pistachios. It's converted into nitric oxide in your body, which is a compound that causes your blood vessels to dilate, aiding blood flow.

4. May aid weight loss
Eating pistachio nuts may aid weight loss. In-shell pistachios are especially beneficial, as they promote mindful eating.

5.  Promote healthy gut bacteria
Pistachios are high in fiber, which is good for your gut bacteria. Eating pistachios may increase the number of bacteria that produce beneficial short-chain fatty acids like butyrate

6. May lower cholesterol and blood pressure
Eating pistachios may help lower blood cholesterol. It may also lower blood pressure more than other nuts.

7. May promote blood vessel health
Pistachio nuts may play an important role in promoting blood vessel health. That's because they are rich in L-arginine, which, when converted into nitric oxide, helps dilate your blood vessels.

8. May help lower blood sugar
Pistachios have a low glycemic index, which might promote lower blood sugar levels.

9. Delicious and fun to eat
Besides being a great snack, pistachios can be used in baking and cooking, adding a green or purple color to various dishes.

Pistachios are a great source of healthy fats, fiber, protein, antioxidants, and various nutrients, including vitamin B6 and thiamine.
Their health effects may include weight loss benefits, lower cholesterol and blood sugar, and improved gut, eye, and blood vessel health