Research has identified numerous compounds in peanuts and in their skins that may add health benefits beyond basic nutrition. Peanuts have been touted as a functional food with numerous functional components. These bioactive nutrients have been recognized for containing disease preventative properties; some are antioxidants, while others are thought to promote longevity. Packaged together with vitamins, minerals, healthy fats, protein, and fiber, peanuts are a complex plant food that promote health with each bite. Simply put, peanuts are bioactive compounds in a shell.
- Arginine, an amino acid with high levels in peanuts, is a precursor to nitric oxide, which helps expand blood vessels and decrease blood pressure.
- Resveratrol, also found in grapes and wine, improves longevity and performance and reduces inflammation.
- Phytosterols are well known for their ability to reduce cholesterol levels and research shows they have cancer-preventing qualities.
- Phenolic acids are found in plants and act as a defense mechanism for environmental stress and pest attacks. Evidence suggests that they may also defend our bodies to keep us healthy.
- Flavonoids are a class of compounds found in peanuts that reduce inflammation and inhibit platelets from sticking to arteries.
If you want to get your blood moving, add more arginine to your diet. Peanuts have one of the highest arginine levels in foods, and contains more arginine than other nuts. Arginine is an amino acid that is a precursor to nitric oxide. Nitric oxide helps to keep your arteries relaxed, improving blood flow. This can help to reduce a person’s risk for heart disease as well as lower blood pressure. Arginine has also been known to improve healing time in your body’s tissues. Arginine has been used as a treatment for erectile dysfunction for many years, and recently has shown potential for increasing libido and reducing infertility.
In attempts to stay youthful, many grapes, as well as peanuts, because they all contain a compound thought to increase endurance and contribute to longevity. This compound is resveratrol. Resveratrol is known as a bioactive nutrient that reduces cardiovascular disease and cancer risk. It has antioxidant properties and also lowers levels of inflammation. All parts of the peanut contain resveratrol, from the roots to the skin—and even the shell.
Many plants naturally produce resveratrol when they are under attack by pathogens such as bacteria. These attacks are a form of stress to the plant and studies are now showing that by stressing peanuts in various ways, the resveratrol content can be increased.
Southern-style boiled peanuts have the highest levels of resveratrol—even more than red wine and red grape juice on a part per million basis. Peanut butter is not too far behind grape juice, with about three times more resveratrol than roasted peanuts with skins.
You may have noticed that there are certain brands of margarine that blend in phytosterols (or plant sterols) to their recipe. This is because these compounds have been found to lower your cholesterol. A handful of peanuts can naturally offer phytosterols leading to this same benefit.
Peanuts, peanut butter, peanut flour, and peanut oil are all filled with phytosterols that block the absorption of cholesterol from your diet. As part of a heart-healthy eating plan, consuming phytosterols in recommended quantities has been shown to lower total cholesterol up to 10 % and LDL or “bad” cholesterol up to 14 %. Emerging evidence shows that they also decrease inflammation and reduce the growth of various cancers. Researchers at the State University of New York at Buffalo found that phytosterols reduce prostate tumor growth by over 40% and decreased the chances of cancer spreading to other parts of the body by almost 50%.
The main phytosterols in peanuts include beta-sitosterol, campesterol, and stigmasterol, but research has found that there are even more phytosterols in peanuts.
Plus, together with healthy fats, protein, and fiber found in peanuts, phytosterols may also be contributing to a decreased risk of heart disease.
Phenolic acids have antioxidant functions and play a protective role against oxidative damage diseases like coronary heart disease, stroke, and various cancers. Roasted peanuts have levels comparable to other common foods like green tea and red wine.
Peanuts and their skins are exceptional sources of functional compounds, including phenolic acids. If you look closely at your spoonful of peanut butter, you will notice small speckles. These speckles are ground peanut skins. Spreading peanut butter on your morning toast not only satisfies your taste buds, but also brings unique health benefits.
P-coumaric acid, a prominent phenolic acid in peanuts, may defend us by acting as an antioxidant to fight disease and maintain health.
Peanuts contain one of the highest levels of p-coumaric acid in foods. A landmark study published in Food Chemistry showed that when peanuts were roasted, levels of p-coumaric acid significantly increased, allowing the peanut’s total antioxidant capacity to increase by as much as 22%. Research conducted in rodents to demonstrate its mechanism of action shows that p-coumaric acid plays an important role in protecting the brain, liver, and kidneys, as well as defending us against cancer.
Flavonoids exist in all parts of the peanut plant. They act as a natural pesticide; some provide potent odors or bitter flavors as a defense system, while others are antimicrobial. In foods, flavonoids are responsible for color, taste, and protection of vitamins, enzymes, and fat oxidation.
A high intake of flavonoids is thought to protect against heart disease and cancer in various ways. They may also play a role in circulation soon after we eat. There is no official recommendation for flavonoids, but research is emerging as to how these bioactive compounds benefit our health. Peanuts and peanut butter are considered major food sources of flavonoids and contain similar types as those found in green and black tea, apples, red wine, and soybeans.
The numerous bioactive components in peanuts contribute to their antioxidant capacity. Compared to well-known foods like green tea and red wine, peanuts have higher antioxidant capacity. When peanuts are consumed with their skins, their antioxidant capacity doubles. And roasting can at times actually increase this capacity as well. When you eat a handful of cocktail peanuts, you can be assured that your body is taking in a myriad of unique compounds to help prevent disease.
Last reviewed: March 2019
Chen, J.Q., et al., Dietary l-arginine supplementation improves semen quality and libido of boars under high ambient temperature. Animal, 2018. 12(8): p.1611-1620.
Phenol-Explorer. Database on polyphenol content in foods. 2018 [cited 2018; Available from: http://phenol-explorer.eu/contents/polyphenol/454.]
Lin, D., et al., An Overview of Plant Phenolic Compounds and Their Importance in Human Nutrition and Management of Type 2 Diabetes. Molecules, 2016. 21(10).
Arya SS, Salve AR, Chauhan S. Peanuts as functional food: a review. J Food Sci Technol. 2016 Jan;53(1):31-41. doi: 10.1007/s13197-015-2007-9. Epub 2015 Sep 19. Review. PubMed PMID: 26787930; PubMed Central PMCID: PMC4711439.
Huang, W.Y., Y.Z. Cai, and Y. Zhang, Natural phenolic compounds from medicinal herbs and dietary plants: potential use for cancer prevention. Nutr Cancer, 2010. 62(1): p. 1-20.
Craft BD, Kosińska A, Amarowicz R, Pegg RB. Antioxidant properties of extracts obtained from raw, dry-roasted, and oil-roasted US peanuts of commercial importance. Plant Foods Hum Nutr. 2010 Sep;65(3):311-8. doi: 10.1007/s11130-010-0160-x. Erratum in: Plant Foods Hum Nutr. 2010 Sep;65(3):309-10. PubMed PMID: 20198439.
Woyengo TA, Ramprasath VR, Jones PJ. Anticancer effects of phytosterols. Eur J Clin Nutr. 2009 Jul;63(7):813-20. doi: 10.1038/ejcn.2009.29. Epub 2009 Jun 3. Review. PubMed PMID: 19491917.
Francisco ML, Resurreccion AV. Functional components in peanuts. Crit Rev Food Sci Nutr. 2008 Sep;48(8):715-46. doi: 10.1080/10408390701640718. Review. PubMed PMID: 18756396.
Halvorsen BL, Carlsen MH, Phillips KM, Bøhn SK, Holte K, Jacobs DR Jr, Blomhoff R. Content of redox-active compounds (ie, antioxidants) in foods consumed in the United States. Am J Clin Nutr. 2006 Jul;84(1):95-135. PubMed PMID: 16825686.
Talcott, S.T., et al., Polyphenolic content and sensory properties of normal and high oleic acid peanuts. Food Chemistry, 2005. 90(3): p. 379-388.
Rudolf JR, Resurreccion AV. Elicitation of resveratrol in peanut kernels by application of abiotic stresses. J Agric Food Chem. 2005 Dec 28;53(26):10186-92. PubMed PMID: 16366713.
Chen RS, Wu PL, Chiou RY. Peanut roots as a source of resveratrol. J Agric Food Chem. 2002 Mar 13;50(6):1665-7. PubMed PMID: 11879054.
Sanders TH, McMichael RW Jr, Hendrix KW. Occurrence of resveratrol in edible peanuts. J Agric Food Chem. 2000 Apr;48(4):1243-6. PubMed PMID: 10775379.
Awad AB, Smith AJ, Fink CS. Plant sterols regulate rat vascular smooth muscle cell growth and prostacyclin release in culture. Prostaglandins Leukot Essent Fatty Acids. 2001 Jun;64(6):323-30. PubMed PMID: 11427042.
Awad AB, Fink CS, Williams H, Kim U. In vitro and in vivo (SCID mice) effects of phytosterols on the growth and dissemination of human prostate cancer PC-3 cells. Eur J Cancer Prev. 2001 Dec;10(6):507-13. PubMed PMID: 11916349.
Ibern-Gómez M, Roig-Pérez S, Lamuela-Raventós RM, de la Torre-Boronat MC. Resveratrol and piceid levels in natural and blended peanut butters. J Agric Food Chem. 2000 Dec;48(12):6352-4. PubMed PMID: 11312807.
Sobolev VS, Cole RJ. trans-resveratrol content in commercial peanuts and peanut products. J Agric Food Chem. 1999 Apr;47(4):1435-9. PubMed PMID: 10563995.