Walnuts: Calories, Properties, and Health Benefits

With a shape reminiscent of the human brain, science now confirms what tradition has supported for centuries: walnuts are one of the most valuable allies for our health. It is no coincidence that these nuts are considered a true “superfood” of nature.

In the article that follows, we will analyze everything about walnuts: calories, nutrients, and nutritional value, while also answering common questions about their benefits and any possible side effects from overconsumption.

Walnuts and Nutritional Value – Everything You Need to Know

Walnuts are considered a valuable addition to your diet. Although extremely nutritious and beneficial to health, they are calorie-dense, which means moderation is recommended in their consumption.

Let’s take a closer look at what they contain:

1. Walnuts and Calories

100 grams contain approximately 654 calories. However, in everyday nutrition, we usually calculate based on serving size.

⇒ One serving of walnuts is 28–30 grams, which corresponds to 7 whole walnuts or 14 halves.

Calories per quantity:

• 1 whole walnut (2 halves): 26–27 calories
• 3 whole walnuts: ~80 calories
• 5 whole walnuts: ~130–140 calories
• 10 whole walnuts: ~260–270 calories
• 1 handful (30g / 14 halves): ~185–190 calories

This small difference in quantity can play a role if you are following a weight-loss diet, which means calorie counting may be necessary.

Tip: Consuming 5–7 walnuts per day is the ideal amount to get their benefits without exceeding your calorie intake.

2. Walnuts and Fatty Acids

Walnuts are rich in healthy polyunsaturated fatty acids (around 65%), with alpha-linolenic acid (omega-3) being the most prominent. These healthy fats are responsible for protecting the heart, as studies show that their consumption helps reduce LDL (“bad”) cholesterol.

3. Walnuts and Protein

A 30-gram serving provides approximately 4.5 g of protein, making walnuts an ideal snack for vegetarians and athletes.
100 grams of walnuts contain about 15 g of protein.

4. Walnuts and Vitamins (Vitamin E & B6)

Walnuts are an excellent source of B-complex vitamins (such as riboflavin, niacin, thiamine, pantothenic acid, vitamin B6, and folate), especially compared to other nuts. They also contain significant amounts of vitamin E, which acts as a powerful antioxidant.

5. Walnuts and Minerals / Trace Elements

Magnesium is one of the main minerals found in walnuts—it contributes to muscle relaxation, stress reduction, and maintaining bone health. At the same time, copper supports vascular and immune health, while manganese is essential for the formation of connective tissues and blood clotting. Finally, walnuts are one of the best plant-based sources of phosphorus, helping enhance bone density at all ages.

6. Walnuts and Dietary Fiber

Walnuts also contain dietary fiber—about 6.7 g per 100 g, while a 30 g serving (14 halves) provides approximately 1.9 g of fiber. Fiber is essential for gut health, slowing down sugar absorption into the bloodstream and helping regulate glucose levels.

7. Walnuts and Antioxidants (Polyphenols)

Walnuts contain more polyphenols than almonds or peanuts. Their antioxidant activity combats oxidative stress, providing long-term health benefits.

You might be interested in: Almonds: Benefits, Properties & Nutritional Value

Nutritional Value (per 100 grams of walnuts)

Walnuts: Properties and Health Benefits

The properties of walnuts extend across many levels, from heart health to mood.

1. Heart Health

The cardiovascular benefits of walnuts are perhaps the most well-documented.

• Reduction of “Bad” Cholesterol (LDL): Regular consumption helps lower LDL and triglyceride levels.
• Artery Protection: Antioxidants (such as polyphenols) prevent cholesterol oxidation, a process that leads to atherosclerosis.

2. Brain Function

Nuts, especially walnuts, contribute to improved memory and concentration.

• Neuroprotection: Omega-3 fatty acids and B vitamins protect brain cells from oxidative stress, reducing the likelihood of degenerative diseases (e.g., Alzheimer’s).
• Improved Cognitive Function: Studies show that walnut consumption is associated with faster information processing, better memory, and increased concentration.

Do Walnuts Have Side Effects?

Although highly beneficial, there are some side effects to consider:

• Allergies: Walnuts are among the most common allergens.
• Digestive Issues: Excessive consumption may cause bloating due to their high fiber content.

Frequently Asked Questions About Walnut Consumption

1. How many walnuts can I eat per day?

The scientifically recommended amount is 30 grams per day, which is about 7 whole walnuts (or 14 halves).

2. When do walnuts go bad?

Walnuts have a high oil content, which makes them prone to rancidity (oxidation). They spoil when they develop a bitter taste or unpleasant smell. This depends on factors such as their quality and storage method. To keep them fresh, store them in an airtight container in the refrigerator.

3. Do walnuts raise cholesterol?

No. This is one of the biggest myths. In reality, regular walnut consumption helps reduce “bad” (LDL) cholesterol and triglycerides, protecting blood vessels.

4. Do walnuts raise blood sugar?

No. Walnuts have a very low glycemic index. The fiber and healthy fats they contain help slow down glucose absorption, making them an excellent snack for people with type 2 diabetes.

5. Walnuts and uric acid – what applies?

Unlike other protein sources, walnuts are low in purines, making them safe (in moderate amounts) for individuals with elevated uric acid levels.

6. When can walnuts be harmful?

Walnuts can be harmful to people with allergies, as they are among the most allergenic foods, according to the FDA. Beyond that, if you consume the recommended daily amount, you are unlikely to encounter any problems.

By incorporating top-quality walnuts from Biologiko Xorio into your daily routine, you provide your body with a natural “medicine” rich in antioxidants and valuable fats. Whether you add them to your salad, yogurt, or simply enjoy them as a snack, their value is truly irreplaceable!