Calories in Walnut: Nutritional facts for Walnut Types

A 100g serving of fresh raw walnuts contains 654 calories, while the same quantity of dry roasted walnuts provides 670 calories. A 100g serving of honey-roasted walnuts contains 680 calories due to the added sugars.

One kilogram (1000g) of fresh raw walnuts contains 6540 calories, whereas a kilogram of dry roasted walnuts provides 6700 calories. One kilogram (1000g) of honey-roasted walnuts supplies 6800 calories.

A single raw walnut kernel (4g) contains 26 calories, while a Diamond of California walnut half (2g) provides 13 calories. A Fisher Nuts walnut half (2g) contains 13 calories, and a Kirkland Signature walnut half (2g) also supplies 13 calories.

Walnuts provide notable physiological advantages, specifically regarding cardiovascular stability, cognitive enhancement, and microbiome support. The nut functions as a concentrated source of omega-3 fatty acids and antioxidants. The following points highlight these benefits.

• Supports Cardiovascular Function: Walnuts contain high levels of alpha-linolenic acid, which reduces inflammation and arterial stiffness. A study by Guasch-Ferré, M., et al. (2013), "Frequency of nut consumption and mortality: risk of cardiovascular disease," confirmed that regular consumption reduces heart disease risks.
• Enhances Cognitive Performance: The high antioxidant content in the skin and flesh combats oxidative stress in the brain. Research by Chauhan, A., & Chauhan, V. (2020), "Beneficial Effects of Walnuts on Cognition and Brain Health," established that reducing oxidative stress improves memory and processing speed.
• Promotes Digestive Balance: Dietary fiber found in the kernel acts as a prebiotic that fosters beneficial gut bacteria. A study by Holscher, H. D., et al. (2018), "Walnut Consumption Alters the Gastrointestinal Microbiota," demonstrated that intake increases the abundance of butyrate-producing bacteria.

The table below shows potential adverse effects associated with consumption, necessitating caution for specific groups.

• Inhibits Mineral Absorption: Walnuts contain phytic acid, which binds to iron and zinc, reducing the bioavailability of these minerals. Research by Schlemmer, U., et al. (2009), " Phytate in foods and significance for humans: food sources, intake, processing, bioavailability, protective role and analysis," indicates that high phytate levels impair mineral absorption. Soaking the nuts serves as an effective alternative to reduce phytic acid content. Dietitians recommend limiting intake to 30g per day to minimize this effect.
• Triggers Allergic Reactions: The nut contains specific proteins that cause immune responses in sensitive individuals. A study by Bartra, J., et al. (2019), " Allergen Recognition Patterns in Walnut Allergy Are Age Dependent and Correlate with the Severity of Allergic Reactions," notes that reactions range from oral allergy syndrome to severe anaphylaxis. Pecans or seeds serve as alternatives for some, though cross-reactivity exists. The daily suggested amount remains zero for allergic individuals.

Yes, walnuts are good for health because the food source supports cardiovascular efficiency, enhances cognitive function, and maintains digestive balance. Heart health improves through the high concentration of alpha-linolenic acid, a mechanism detailed in the study by Pan, A., et al. (2012), "Alpha-Linolenic Acid and Risk of Cardiovascular Disease." Brain health benefits from the neuroprotective compounds found in the skin and flesh, as explored by Poulose, S. M., et al. (2014), "Role of Walnuts in Maintaining Brain Health with Age." Digestive health strengthens due to the prebiotic potential of the fiber content, which fosters beneficial gut bacteria as confirmed by the study by Bamberger, C., et al. (2018), "A Walnut-Enriched Diet Affects Gut Microbiome in Healthy Caucasian Subjects." Liver health also benefits from the omega-3 fatty acids, which help reduce fat accumulation in hepatic tissue.

Caloric density fluctuates between the common English variety and the wilder Black and White species. English Walnuts present the highest energy load at 654 calories per 100 grams due to a higher fat composition. Black Walnuts offer a moderate profile at 618 calories per 100 grams. White Walnuts contain the lowest energy content at 612 calories per 100 grams.

Yes, walnuts rank as a high-calorie nut compared to almonds and cashews but contain fewer calories than macadamia nuts and pecans. A 100g serving of walnuts supplies 654 calories, whereas the same amount of macadamia nuts provides 718 calories. Almonds offer a lower energy density at 579 calories per 100g. The high fat content in walnuts drives the caloric value above the average for tree nuts.

Yes, walnuts function as an exceptional source of plant-based protein and essential fatty acids. A single cup of chopped walnuts contains 17.8g of protein, supporting muscle repair and enzymatic activity. The lipid profile consists largely of polyunsaturated fats, specifically alpha-linolenic acid (ALA), which constitutes the plant-based form of omega-3. This fatty acid composition reduces inflammation and improves cholesterol levels. The high fat content provides sustained energy, making the nut a calorically dense but nutrient-rich food option.

Walnuts originated in the region surrounding the Caspian Sea, specifically ancient Persia, dating back to 7000 B.C. The Romans cultivated the tree extensively, naming the species Juglans regia or "Jupiter's royal acorn." Trade routes along the Silk Road facilitated the spread of the nut to China and eventually Europe. English merchant marines transported the Persian variety to global markets, leading to the moniker "English Walnut." Black Walnuts developed independently in North America, serving as a food source for Indigenous populations long before European settlement. Franciscan fathers introduced the English variety to California in the late 1700s, establishing the foundation for modern commercial production in the United States.