Nutrition

8 Amazing Benefits of Walnuts for Your Health 2025: Nutrition & Diet

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Walnuts are one of the most frequently used tree nuts in diets. The benefits of walnuts are based on their essential nutrients such as healthy fat (omega-3 fatty acids content), vitamin (especially vitamin E), mineral, and fiber content.

So what are walnuts good for? Read on to find out the amazing health benefits of walnuts.

8 Amazing Health Benefits of Walnuts

  1. Prevent developing Type II diabetes
  2. Aid weight loss
  3. Heart health
  4. Cognitive function and brain health
  5. Reduce inflammation
  6. Gut health and digestive system
  7. Women’s health
  8. Skin health

8 Health Benefits of Eating Walnuts

Walnuts are commonly used tree nuts that help to improve diet quality while giving a great flavor to your dishes or salads.

Studies showed that the rich nutrient content of walnuts helps to improve cardiovascular health, digestive function, brain health, and immunity.

Prevent Developing Type II Diabetes

The National Health and Nutrition Examination Survey[1] results indicated that the risk of diabetes was significantly decreased in the consuming-walnut group than in non-consumers.

The evidence also showed that the risks of both high fasting blood glucose and hemoglobin A1C level (a diagnostic marker for diabetes) were also decreased in the walnut-consuming group.

Eating walnuts and its association with reducing the risk of developing type II diabetes (T2D) were investigated. While these effects were more potent in women than in men, there were definite benefits of walnuts on diabetes prevention for men, as well.

As a part of the PREDIMED study[2], the walnut consumption-related metabolites were shown to be inversely associated with the incidence of type II diabetes prevalence: more walnuts meant less T2D. However, it might not be a direct relationship [SEE NEXT SECTION].

Hyperglycemia[3] (high level of blood glucose) is the main reason for many different chronic diseases related to diabetes and insulin resistance–arteriosclerosis, obesity, and cardiovascular disease.

Are Walnuts Effective To Reduce Blood Glucose?

The cumulative analysis[4] of different studies investigating walnuts’ effect on blood glucose showed there was no relation between walnut consumption and reducing blood glucose.

Similar results were obtained in another meta-analysis[5] study that showed blood glucose levels didn’t alter with walnut consumption.

Although walnuts do not appear to improve blood glucose directly, it may be that consuming walnuts increases blood adiponectin and leptin[6] levels. These peptides mainly regulate appetite control by affecting the hunger center in the brain, reducing consumption, and mitigating blood glucose that way.

Aid Weight Loss

Research shows that walnuts are a great choice for weight management because of high polyunsaturated fats and fiber content. According to specialists, it is frequently recommended as a daily healthy snack for diets.

As such, walnuts are often consumed as snacks or ingredients in meals.

The common walnut is one the healthiest nuts to control body weight via it being an excellent fatty acid and anti-inflammatory source.

A meta-analysis study[6] suggested that although walnut intake does not affect weight loss in and of itself, it yet may help weight loss by lowering body mass index and waist circumferences based on dosage (up to 35 gr/day), according to subgroup analysis based on intervention types.

However, a Harvard publication cites another study[7] using brain imaging that showed eating walnuts stimulates a part of the brain that decreased feelings of hunger and appetite which may lead to weight loss.

However, it should be mentioned that a high level of walnut intake may cause excessive calorie and fat intake which can only sabotage weight loss.

Heart Health

The most obvious health benefits of walnuts are on cardiovascular risk factors and heart disease.

For metabolic syndrome patients who have a risk for coronary heart disease, it was shown that[8] the serum triglyceride level was significantly lower in the group who consumed walnuts than in the non-walnut consumer group.

This was corroborated in another meta-analysis study[9] in which a walnut-enriched daily diet reduced total blood cholesterol, low-density lipoprotein (LDL) cholesterol, and triglyceride levels. The most beneficial effect of walnuts is reducing LDL cholesterol for heart health.

As is well known, LDL is “bad” cholesterol and the main risk factor for many cardiovascular problems, from atherosclerosis to heart failure.

As excessive LDL cholesterol has the potential for oxidation by free radicals which cause inflammation. Oxidized-LDL cholesterol[10] can easily accumulate in vascular walls or lead to an inflammatory response in the area.

Can Walnuts Also Help Hypertension?

A major meta-analysis study[11] explored blood pressure alteration with walnut consumption by both the duration and the volume of daily dietary intake and found effects spanning, at best, only 1 mmHg on BP, e.g. from 120/80 to 119/79. This is not considered significant to alter any clinical management.

Cognitive Function and Brain Health

As a part of the PREDIMED study, brain function was investigated. Eating nuts 30g/day in the Mediterranean diet (particularly walnuts, 15gr) showed better cognitive performance[12] and improvements in memory[13] compared to low-fat diets.

Another clinical study[14] conducted with women aged 70+ showed that women who took five or more servings of nuts per week delayed their cognitive aging compared to women who did not consume nuts. The brain function score difference between these two groups was equivalent to two years of cognitive aging.

In the National Health and Nutrition Examination Study (NHANES)[15], the health benefits of consuming walnuts on brain health among different age groups from 20 to 60+ were investigated.

The results were that eating walnuts improves brain function in each age group. It is due to the essential fatty acid content of walnuts.

Reduce Inflammation

Clinical nutrition studies show that the nutrient content of foods is the main down-regulator for inflammatory pathways.

Nuts are a rich source of healthy fats such as monounsaturated fatty acids (MUFAs) and polyunsaturated fatty acids (PUFAs).

Walnuts are known as the most common alternative plant-based omega-3 fatty acids source[16], especially for vegan and vegetarian consumers.

Gut Health and Digestive System

Gut health (microbiota) was another reason people who eat walnuts improve general health.

A randomized, controlled trial[17] showed that the walnuts increased the abundance of Firmicutes bacteria which are healthy species for microbiota.

Also, walnut intake reduced pro-inflammatory bile acids and unhealthy gut species, as well as LDL cholesterol.

Walnuts should be taken as a plant-based superfood that has low lectin levels. Too much lectin consumption due to plant-based eating habits may have harmful effects, such as gastrointestinal problems. Among the nut family, walnuts have a low lectin level.

Women’s Health

Healthy aging is an important factor in women’s health. It was shown[18] that nut consumption may reduce age-related diseases and lead to well-being and reduced risk of chronic diseases in women.

Women make up an interesting demographic, combining attributes of hormones, age, and gender. This makes them an important group to include in any dietary study.

The researchers found a relationship between healthy aging and nuts. After further analysis, only walnut consumption was found to be associated with healthy aging, according to 33,931 female participants during midlife.

Skin Health

Relation between walnut consumption and skin health wasn’t shown directly in the studies up to date.

However, the healthy lipid content and anti-inflammatory properties of walnuts may promote a healthy skin barrier and healing. This is due to the omega-3 fatty acids, well known to improve skin health[19].

Beyond just the fatty acid component, vitamin E and polyphenols[20] in walnuts are observed to be beneficial for skin integrity.

Nuts support skin health with their essential fatty acids contents, and the walnut is one of the effective ones to protect your skin.

Nutrition Facts

The nutritional value[21] adjusted for 28 g (7 nuts) of walnut:

  • Energy: 183.12 kcal
  • Protein: 4.26g
  • Total Lipid: 18.25g
  • Total Fiber: 1.9g
  • Carbohydrate: 3.83g
  • Calcium: 27.44mg
  • Magnesium: 44.24mg
  • Potassium: 123.48mg
  • Linoleic acid (omega-6): 10.8g
  • Alpha-linolenic acid(omega-3): 2.54g
  • Omega-6/Omega-3 fatty acids ratio: 4.25

How To Add Walnuts To Your Diet?

Walnuts can easily be used for meal prep or snacks. Here are the ways that you could eat walnuts:

  • Eat walnuts with fruits for a snack: You can try to eat walnuts with fresh fruits such as apples, bananas, or berries to balance the glycemic index.
  • On top of porridge and cereals: It is a good choice to eat walnuts in your porridge and cereal to feel satiety for a longer time.
  • Dips and sauces: Thanks to the oily content and unique flavor of walnut, its use in pasta or snack sauces is quite common in world cuisine.
  • Bakery products or bread: Walnuts are added to enrich bakery and bread products with healthy oils and minerals.

How To Store Walnuts?

According to the storage analysis[22] of walnuts’ antioxidant and toxin content in different conditions, the best storage condition for a short time is preserving walnuts within their hard shell at room temperature; and for a long time is keeping peeled walnuts in the fridge to improve the shelf life.

It was found that preserving walnuts at room temperature, not in the refrigerator, resulted in greater lipid oxidation and reduction in antioxidant activity after more than 6 months.

The Bottom Line: Are Walnuts Good for You?

Walnuts taste good, but they’re also good for your heart health, due to the omega-3 acids, antioxidants, and even a brain-influencing appetite suppressant that helps with obesity and diabetes.

The rich content helps to improve immunity and prevent inflammatory reactions which are related to the pathological pathway of each disease.

Also, walnuts have gotten the attention of neuroscientists who have found benefits for cognitive issues with aging. Diets, e.g., the Mediterranean Diet, include walnuts as a course of healthy fats.

You can easily add walnuts to your daily diets as snacks, appetizers, or directly in your meals. These enrichments make your diet more balanced and preventive for many diseases.

+ 22 Sources

  1. Arab, L., Dhaliwal, S.K., Martin, C.J., Larios, A.D., Jackson, N.J. and Elashoff, D. (2018). Association between walnut consumption and diabetes risk in NHANES. Diabetes/Metabolism Research and Reviews, [online] 34(7), p.e3031. doi:10.1002/dmrr.3031.
  2. Guasch-Ferré, M., Hernández-Alonso, P., Drouin-Chartier, J.-P., Ruiz-Canela, M., Razquin, C., Toledo, E., Li, J., Dennis, C., Wittenbecher, C., Corella, D., Estruch, R., Fitó, M., Ros, E., Babio, N., Bhupathiraju, S.N., Clish, C.B., Liang, L., Martínez-González, M.A., Hu, F.B. and Salas-Salvadó, J. (2020). Walnut Consumption, Plasma Metabolomics, and Risk of Type 2 Diabetes and Cardiovascular Disease. The Journal of Nutrition, [online] 151(2), pp.303–311. doi:10.1093/jn/nxaa374.
  3. Diabetes.org. (2022). Hyperglycemia (High Blood Glucose) | ADA. [online] Available at: https://diabetes.org/healthy-living/medication-treatments/blood-glucose-testing-and-control/hyperglycemia
  4. Neale, E.P., Guan, V., Tapsell, L.C. and Probst, Y.C. (2020). Effect of walnut consumption on markers of blood glucose control: a systematic review and meta-analysis. British Journal of Nutrition, [online] 124(7), pp.641–653. doi:10.1017/s0007114520001415.
  5. Malmir, H., Larijani, B. and Esmaillzadeh, A. (2021). The effect of walnut consumption on cardiometabolic profiles of individuals with abnormal glucose homoeostasis: a systematic review and meta-analysis of clinical trials. British Journal of Nutrition, [online] 128(6), pp.1037–1049. doi:10.1017/s0007114521004414.
  6. Yang, L., Guo, Z., Qi, S., Fang, T., Zhu, H., Santos, H.O., Khani, V., Wong, C.H. and Qiu, Z. (2020). Walnut intake may increase circulating adiponectin and leptin levels but does not improve glycemic biomarkers: A systematic review and meta-analysis of randomized clinical trials. Complementary Therapies in Medicine, [online] 52, p.102505. doi:10.1016/j.ctim.2020.102505.
  7. Farr, O.M., Tuccinardi, D., Upadhyay, J., Oussaada, S.M. and Mantzoros, C.S. (2017). Walnut consumption increases activation of the insula to highly desirable food cues: A randomized, double-blind, placebo-controlled, cross-over fMRI study. Diabetes, Obesity and Metabolism, [online] 20(1), pp.173–177. doi:10.1111/dom.13060.
  8. Arabi, S.M., Bahrami, L.S., Milkarizi, N., Nematy, M., Kalmykov, V. and Sahebkar, A. (2022). Impact of walnut consumption on cardio metabolic and anthropometric parameters in metabolic syndrome patients: GRADE-assessed systematic review and dose-response meta-analysis of data from randomized controlled trials. Pharmacological Research, [online] 178, p.106190. doi:10.1016/j.phrs.2022.106190.
  9. Guasch-Ferré, M., Li, J., Hu, F.B., Salas-Salvadó, J. and Tobias, D.K. (2018). Effects of walnut consumption on blood lipids and other cardiovascular risk factors: an updated meta-analysis and systematic review of controlled trials. The American Journal of Clinical Nutrition, [online] 108(1), pp.174–187. doi:10.1093/ajcn/nqy091.
  10. Khatana, C., Saini, N.K., Chakrabarti, S., Saini, V., Sharma, A., Saini, R.V. and Saini, A.K. (2020). Mechanistic Insights into the Oxidized Low-Density Lipoprotein-Induced Atherosclerosis. Oxidative Medicine and Cellular Longevity, [online] 2020, pp.1–14. doi:10.1155/2020/5245308.
  11. Li, J., Jiang, B., O. Santos, H., Santos, D., Singh, A. and Wang, L. (2020). Effects of walnut intake on blood pressure: A systematic review and meta-analysis of randomized controlled trials. Phytotherapy Research, [online] 34(11), pp.2921–2931. doi:10.1002/ptr.6740.
  12. Martínez-Lapiscina, E.H., Clavero, P., Toledo, E., Estruch, R., Salas-Salvadó, J., San Julián, B., Sanchez-Tainta, A., Ros, E., Valls-Pedret, C. and Martinez-Gonzalez, M.Á. (2013). Mediterranean diet improves cognition: the PREDIMED-NAVARRA randomised trial. Journal of Neurology, Neurosurgery & Psychiatry, [online] 84(12), pp.1318–1325. doi:10.1136/jnnp-2012-304792.
  13. Valls-Pedret, C., Sala-Vila, A., Serra-Mir, M., Corella, D., de la Torre, R., Martínez-González, M.Á., Martínez-Lapiscina, E.H., Fitó, M., Pérez-Heras, A., Salas-Salvadó, J., Estruch, R. and Ros, E. (2015). Mediterranean Diet and Age-Related Cognitive Decline. JAMA Internal Medicine, [online] 175(7), p.1094. doi:10.1001/jamainternmed.2015.1668.
  14. O’Brien, J., Okereke, O., Devore, E., Rosner, B., Breteler, M. and Grodstein, F. (2014). Long-term intake of nuts in relation to cognitive function in older women. The journal of nutrition, health & aging, [online] 18(5), pp.496–502. doi:10.1007/s12603-014-0014-6.
  15. Arab, L. and Ang, A. (2014). A cross sectional study of the association between walnut consumption and cognitive function among adult us populations represented in NHANES. The journal of nutrition, health & aging, [online] 19(3), pp.284–290. doi:10.1007/s12603-014-0569-2.
  16. Santos, H.O., Price, J.C. and Bueno, A.A. (2020). Beyond Fish Oil Supplementation: The Effects of Alternative Plant Sources of Omega-3 Polyunsaturated Fatty Acids upon Lipid Indexes and Cardiometabolic Biomarkers—An Overview. Nutrients, [online] 12(10), p.3159. doi:10.3390/nu12103159.
  17. Holscher, H.D., Guetterman, H.M., Swanson, K.S., An, R., Matthan, N.R., Lichtenstein, A.H., Novotny, J.A. and Baer, D.J. (2018). Walnut Consumption Alters the Gastrointestinal Microbiota, Microbially Derived Secondary Bile Acids, and Health Markers in Healthy Adults: A Randomized Controlled Trial. The Journal of Nutrition, [online] 148(6), pp.861–867. doi:10.1093/jn/nxy004.
  18. Freitas-Simoes, T.-M., Wagner, M., Samieri, C., Sala-Vila, A. and Grodstein, F. (2020). Consumption of Nuts at Midlife and Healthy Aging in Women. Journal of Aging Research, [online] 2020, pp.1–7. doi:10.1155/2020/5651737.
  19. Balic, A., Vlašic, D., Žužul, K., Marinovic, B. and Bukvic Mokos, Z. (2020). Omega-3 Versus Omega-6 Polyunsaturated Fatty Acids in the Prevention and Treatment of Inflammatory Skin Diseases. International Journal of Molecular Sciences, [online] 21(3), p.741. doi:10.3390/ijms21030741.
  20. Critical Reviews in Food Science and Nutrition. (2017). Health benefits of walnut polyphenols: An exploration beyond their lipid profile. [online] Available at: https://www.tandfonline.com/doi/abs/10.1080/10408398.2015.1126218?journalCode=bfsn20
  21. Usda.gov. (2022). FoodData Central. [online] Available at: https://fdc.nal.usda.gov/fdc-app.html#/food-details/170187/nutrients
  22. Monsef, A., Azamabbasi, Shaghaghian, S. and Sharafati-Chaleshtori, R. (2020). Monsef et al. The Effect of Various Shelf Life and Conditions on Storage of Walnuts Walnut Storage Shelf life Temperature Aflatoxin. Int J Nutr Sci, [online] 5(3). doi:10.30476/IJNS.2020.87611.1084.