Peanut oil happens to be among the healthier cooking oils. It is believed to be low in cholesterol and trans fats, though more research is warranted. Most anecdotal evidence suggests that the oil could be a healthier alternative.
However, the oil may also have possible side effects. In this post, we will discuss both sides of the oil. We will also understand if peanut oil is really fit for use in cooking.
Table Of Contents
What Is Peanut Oil?
Peanut oil is often referred to as groundnut oil. It is a vegetable oil extracted from the seeds of the peanut plant.
Some believe that the goodness of peanut oil primarily boils down to its vitamin E content. Vitamin E is an antioxidant known to reduce free radical damage and cut heart disease risk (1).
What Are The Different Types Of Peanut Oil?
Peanut oil is available in different types:
- Refined peanut oil, which is refined, bleached, and deodorized. The process removes allergens in the oil, and this makes it safe for people with peanut allergies.
- Cold-pressed peanut oil, where the peanuts are crushed, and the oil is forced out. This one retains more flavor and nutrients.
- Gourmet peanut oil that is usually roasted and has an intense flavor.
- Peanut oil blend, where the oil is blended with another oil with a similar taste.
What Are The Benefits Of Peanut Oil?
1. May Promote Heart Health
The oil is also rich in monounsaturated and polyunsaturated fats (2). These are linked to a lowered cardiovascular disease risk. As per the American Heart Association, these types of fats can reduce heart disease risk by as much as 30% (4).
Some anecdotal evidence suggests that the oil may also lower bad cholesterol levels. However, more research is needed to support this statement.
2. May Enhance Cognitive Health
There is no direct research stating that peanut oil may promote cognitive health. However, the vitamin E it contains may play a role.
Studies show that vitamin E may promote healthy brain aging in the elderly. The nutrient may also reduce the risk of Alzheimer’s disease (5).
Vitamin E supplementation was also found to boost motor activities in individuals (5).
3. May Improve Insulin Sensitivity
Peanut oil contains oleic acid, which was found to improve insulin production in type 2 diabetes. A diet high in peanut oil can also reverse the negative effects of inflammation on type 2 diabetes (6).
Peanut oil also contains polyunsaturated fatty acids. These are healthy fats. Studies show that PUFAs may improve blood glucose levels, treat insulin resistance, and enhance insulin secretion capacity. Replacing dietary saturated fat with polyunsaturated fat improved insulin secretion in those with diabetes (7).
A combination of monounsaturated and polyunsaturated fats (as present in peanut oil) may also enhance insulin sensitivity in individuals with diabetes.
4. May Help Reduce Cancer Risk
Peanut oil contains phytosterols, compounds recognized for their potential anticancer properties. These compounds might reduce the risk of the cancers of the prostate and colon. Some research states that they may reduce the risk of breast cancer (8).
Phytosterols, in general, have also been studied for their anticancer effects. Emerging evidence states that these compounds may inhibit the cancers of the lung, stomach, and ovaries (9).
Some believe that the polyphenol antioxidants in peanut oil fight free radicals, which may contribute to cancer prevention. Peanut oil may act as a natural tonic that may boost immune levels.
5. May Help Relieve Joint Pains
The oil could be used to relieve debilitating joint pains. Peanut oil is applied to the skin directly and massaged well, and this may offer some relief. However, there is insufficient information on the topical application of peanut oil. Please consult your doctor before you use the oil for this purpose.
Insufficient Evidence For The Following
6. May Delay Signs Of Aging
There is no direct research stating that peanut oil may delay the signs of aging. However, some research states that the vitamin E in the oil could help in this regard (11).
Vitamin E is an important ingredient in most over-the-counter anti-aging products (11).
Vitamin E also fights the adverse effects of oxidative stress. Some of these effects include photoaging (which is the accelerated aging of the skin with the influence of UV radiation) (12).
Applying peanut oil topically may offer anti-aging benefits, though there is no research to prove this. The vitamin E it contains may fight free radicals, which may otherwise accelerate aging signs like wrinkles and fine lines.
7. May Treat Dry Skin
Topical vitamin E may improve the symptoms of atopic dermatitis. The condition is characterized by red and itchy skin, sometimes accompanied by dry skin (13).
The topical application of peanut oil could help treat dry skin, but research is limited. Some believe the oil also has moisturizing properties that could help. You can apply the oil to your face and other affected areas and leave it on for about 20 minutes. Take a bath as usual.
8. May Boost Hair Growth
Some research suggests that the ingestion of vitamin E supplements may boost hair growth (14). But there is limited information if the same effect could be achieved with topical application.
Some believe that the topical application of vitamin E may reduce protein loss from hair and make it thicker. The oil is also thought to moisturize split ends and regenerate damaged hair.
9. May Help Treat Scalp Psoriasis
Some studies state that vitamin E may aid the treatment of psoriasis, including that of the skin and scalp (15).
Anecdotal evidence suggests that the antioxidants in peanut oil may treat dandruff, and in some cases, can aid the treatment of scalp psoriasis. This could be attributed to the moisturizing properties of peanut oil.
How Else Can Peanut Oil Be Used?
There are different ways peanut oil can be used:
Peanut oil is low in saturated fats and rich in monounsaturated and polyunsaturated fats. This is why it is ideal for cooking. It works particularly well with Asian foods that are predominantly prepared in the wok.
- Making Soap
You can also use the oil to make soap. Thanks to its conditioning properties, the soap can boost skin health. One downside is that the oil may not last long in your soap as it can turn rancid quite fast.
- Making Biodiesel
Peanuts are more than 50% oil, which is why one acre of them produces about 123 gallons of oil. Though this alternative fuel is slightly expensive, it might be where the future lies.
In fact, this has been happening since the 1960s. The oil was used in influenza shots to lengthen immunity in patients.
These are certain other ways peanut oil is used. Do you want to know what else the oil contains? Scroll down to the next section.
What Is The Nutritional Profile Of Peanut Oil?
One cup of peanut oil offers you 169% of the daily value of vitamin E. The following table shows the nutritional value of peanut oil in detail.
|Nutrition Facts Serving Size 216g|
|Amount Per Serving|
|Calories 1910||Calories from Fat 1910|
|% Daily Value*|
|Total Fat 216g||332%|
|Saturated Fat 36g||182%|
|Total Carbohydrate 0g||0%|
|Dietary Fiber 0g||0%|
|Amounts Per Selected Serving||%DV|
|From Carbohydrate||0.0(0.0 kJ)|
|From Fat||1910(7997 kJ)|
|From Protein||0.0(0.0 kJ)|
|From Alcohol||0.0(0.0 kJ)|
|Fats & Fatty Acids|
|Amounts Per Selected Serving||%DV|
|Total Fat||216 g||332%|
|Saturated Fat||36.5 g||182%|
|Monounsaturated Fat||99.8 g|
|Polyunsaturated Fat||69.1 g|
|Total trans fatty acids||~|
|Total trans-monoenoic fatty acids||~|
|Total trans-polyenoic fatty acids||~|
|Total Omega-3 fatty acids||~|
|Total Omega-6 fatty acids||69131 mg|
|Amounts Per Selected Serving||%DV|
|Vitamin A||0.0 IU||0%|
|Vitamin C||0.0 mg||0%|
|Vitamin E (Alpha Tocopherol)||33.9 mg||169%|
|Vitamin K||1.5 mcg||2%|
|Vitamin B6||0.0 mg||0%|
|Vitamin B12||0.0 mcg||0%|
|Pantothenic Acid||0.0 mg||0%|
Values sourced from U.S. Department of Agriculture, oil, peanut
Excess intake of peanut oil may cause certain side effects. We have discussed them in the next section.
Side Effects And Allergies Of Peanut Oil
- High Amount Of Omega-6 Fatty Acids
Peanut oil is high in omega-6 fatty acids. Though these fatty acids are important, their excess intake may cause issues. Omega-6 fatty acids tend to be pro-inflammatory in nature (16).
The typical Western diet consists of higher amounts of omega-6 fatty acids than omega-3 fatty acids. When this is the case, adding excess of peanut oil may further increase the levels of omega-6 fatty acids. This can increase the risk of cardiovascular disease, non-alcoholic fatty liver disease, obesity, and inflammatory bowel disease (16).
Those having a peanut allergy may also develop an allergic response to the oil. Signs of these allergies include urticaria (a type of round skin rash), gastrointestinal and upper respiratory tract reactions, and anaphylaxis (17).
- The Oil Could Be Prone To Oxidation
The polyunsaturated fatty acids in the oil may be easily prone to oxidation. Merely heating the oil can result in this phenomenon. This oxidation can create free radicals that can cause harm to the body (also called oxidative damage). This may cause inflammation and damage the immune system (18).
Hence, using peanut oil regularly for cooking may not be a good idea. You may want to go for a healthier option, like olive oil (extra virgin olive oil could be a better idea).
In case you are pregnant or breastfeeding, stick to normal amounts of peanut oil (after consulting your doctor). Don’t consume excess of it. Also, avoid the oil if you are allergic to peanuts, soybeans, and other related plants (members from the Fabaceae plant family).
The essential fatty acids in peanut oil could make it healthy. However, most of its benefits are yet to be validated by research. We suggest you look at alternatives if you are to use oil in your cooking. You may use peanut oil sparingly. Remember to consult your doctor before using peanut oil.
Expert’s Answers for Readers Questions
What is a good substitute for peanut oil?
Almond oil can be a good substitute, given it has a similarly high smoke point.
How long does peanut oil last?
Unopened peanut oil can last for about a year. But once opened, it lasts only for four to six months. It can get rancid after that.
Is peanut oil better than olive oil?
Though both are rich in polyunsaturated fatty acids, peanut oil has higher levels of omega-6 fatty acids. Hence, it may not be as healthy as olive oil in cooking. In terms of regular use, olive oil could be better than peanut oil.
How long does it take to heat peanut oil?
Peanut oil takes about 10 minutes to get heated.
What temperature does peanut oil boil at?
Peanut oil boils at about 450o F (also called smoke point).
- The Role of Vitamin E in Human Health and Some Diseases, Sultan Qaboos University Medical Journal, US National Library of Medicine, National Institutes of Health.
- Oil, peanut, salad or cooking, U.S. Department of Agriculture.
- Dietary Fats and Cardiovascular Disease: A Presidential Advisory From the American Heart Association, Circulation, American Heart Association.
- Effects of Vitamin E on Cognitive Performance during Ageing and in Alzheimer’s Disease, Nutrients, US National Library of Medicine, National Institutes of Health.
- Oleic acid and peanut oil high in oleic acid reverse the inhibitory effect of insulin production of the inflammatory cytokine TNF-alpha both in vitro and in vivo systems, Lipids in Health and Disease, US National Library of Medicine, National Institutes of Health.
- Effects of Saturated Fat, Polyunsaturated Fat, Monounsaturated Fat, and Carbohydrate on Glucose-Insulin Homeostasis: A Systematic Review and Meta-analysis of Randomised Controlled Feeding Trials, PlOS One.
- Peanuts as a source of beta-sitosterol, a sterol with anticancer properties, Nutrition and Cancer, US National Library of Medicine, National Institutes of Health.
- Anticancer effects of phytosterols, European Journal of Clinical Nutrition, US National Library of Medicine, National Institutes of Health.
- Polyunsaturated fatty acids: any role in rheumatoid arthritis?, Lipids in Health and Disease, US National Library of Medicine, National Institutes of Health.
- Vitamin E in dermatology, Indian Dermatology Online Journal, US National Library of Medicine, National Institutes of Health.
- The role of vitamin E in normal and damaged skin, Journal of Molecular Medicine, US National Library of Medicine, National Institutes of Health.
- Effects of oral vitamin E on treatment of atopic dermatitis: A randomized controlled trial, Journal of Research in Medical Sciences, US National Library of Medicine, National Institutes of Health.
- Effects of Tocotrienol Supplementation on Hair Growth in Human Volunteers, Tropical Life Sciences Research, US National Library of Medicine, National Institutes of Health.
- Efficacy of nutritional treatment in patients with psoriasis: A case report, Experimental and Therapeutic Medicine, US National Library of Medicine, National Institutes of Health.
- Health Implications of High Dietary Omega-6 Polyunsaturated Fatty Acids, Journal of Nutrition and Metabolism, US National Library of Medicine, National Institutes of Health.
- Allergy to peanut oil–clinically relevant?, Journal of the European Academy of Dermatology and Venereology, US National Library of Medicine, National Institutes of Health.
- Oxidative stress, inflammation, and cancer: How are they linked?, Free Radical Biology & Medicine, US National Library of Medicine, National Institutes of Health.
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