Sesame Oil

Overview

Sesame oil is extracted from the seeds of Sesamum indicum, one of the oldest cultivated oil crops in human history, with evidence of production dating back over 5,000 years in the Indian subcontinent and the Middle East. Two main types are used in cooking: light (or refined) sesame oil, which has a mild flavour and a high smoke point suitable for stir-frying; and toasted (dark) sesame oil, which is pressed from roasted seeds and carries a deep, nutty aroma used as a finishing oil in East Asian cuisines. Both types are rich in healthy unsaturated fatty acids and unique lignans that give sesame oil exceptional oxidative stability compared to most other vegetable oils.

Nutritional Highlights

• Sesamol and sesamin (lignans): These plant phenols are unique to sesame oil and act as powerful antioxidants that protect the oil from rancidity and, within the body, help reduce oxidative stress and inflammation. Sesamin has also been studied for its ability to inhibit the conversion of omega-6 to pro-inflammatory compounds.
• Oleic acid (omega-9): Approximately 40% of sesame oil's fat is oleic acid, the same monounsaturated fat prominent in olive oil, associated with reduced LDL cholesterol and improved cardiovascular health.
• Linoleic acid (omega-6): Around 45% of the fat is linoleic acid, an essential polyunsaturated fatty acid that supports skin integrity and immune function when consumed in appropriate amounts.
• Vitamin E (tocopherols): Sesame oil provides tocopherols that protect cell membranes from oxidative damage and support immune function.
• Sesamolin: A lignan precursor converted to sesamol in the gut, contributing further to the oil's antioxidant activity and liver-protective effects observed in animal studies.

Health Benefits

Sesame oil has been studied extensively for its cardiovascular effects. A 2016 randomised controlled trial published in the Journal of Clinical Lipidology found that substituting sesame oil for other cooking oils significantly reduced blood pressure and improved lipid profiles in patients with hypertension. Researchers attributed these effects to the combination of oleic and linoleic acids alongside the anti-inflammatory lignans sesamol and sesamin, which together appear to reduce oxidative stress in vascular walls.

The lignan content of sesame oil gives it notably greater antioxidant stability than oils such as sunflower or corn oil, which lack these protective compounds. Studies measuring peroxide and anisidine values — markers of fat oxidation — consistently show sesame oil maintains quality longer under heat and storage conditions. This stability makes it one of the safer polyunsaturated oils for moderate-heat cooking, particularly the light (untoasted) variety.

Preliminary research has examined sesamin's potential role in liver health. In animal and cell studies, sesamin has been shown to increase antioxidant enzyme activity in the liver and protect against lipid accumulation. While human clinical data are limited, these findings align with traditional Ayurvedic and Unani uses of sesame oil in which liver protection was a claimed benefit.

Sesame oil is also associated with oral health in traditional practices. "Oil pulling" with sesame oil — swishing a tablespoon in the mouth for 10–15 minutes — has been shown in small controlled trials to reduce Streptococcus mutans counts and improve gingival health, though it should be considered complementary to, not a replacement for, standard oral hygiene.

How to Use

• Use toasted sesame oil as a finishing oil: Add a small drizzle (half to one teaspoon) to stir-fries, noodles, soups, or steamed vegetables just before serving to maximise its aroma without prolonged heat exposure, which degrades its delicate volatile compounds.
• Use light sesame oil for cooking: With a smoke point of around 210°C (410°F), light sesame oil is suitable for sautéing and shallow frying. It pairs particularly well with Asian-inspired dishes and marinades for tofu, chicken, and fish.
• Make sesame dressings: Whisk toasted sesame oil with rice vinegar, soy sauce, a touch of honey, and minced ginger for a quick dressing for slaws, grain bowls, and cucumber salads.
• Blend into tahini-based sauces: Sesame oil can thin out tahini and amplify its flavour when making hummus, baba ganoush, or noodle sauces.
• Store in a cool, dark place: Light degrades the lignans and accelerates oxidation. Toasted sesame oil in particular should be refrigerated after opening and used within three to four months; light sesame oil lasts slightly longer due to its lower polyphenol and moisture content from the roasting process.