Sesame Seeds

Overview

Sesame seeds (Sesamum indicum) are among the oldest oilseed crops in the world, cultivated for at least 5,000 years across South Asia, the Middle East, and Africa. The small, flat seeds come in white, black, and brown varieties, each with a subtly different flavour and antioxidant profile. White sesame seeds, with hulls removed, are most commonly used in baked goods and as a garnish; black sesame seeds retain their hull, giving them a stronger flavour and slightly higher antioxidant content. Sesame seeds are the primary ingredient in tahini (sesame paste) and are pressed to make sesame oil. Their remarkable fat-to-mineral ratio makes them a standout plant source of calcium, iron, and zinc.

Nutritional Highlights

• Calcium: Unhulled sesame seeds provide approximately 975 mg of calcium per 100 g — nearly twice the calcium density of cow's milk by weight — making them one of the richest plant sources of this mineral. Even hulled (white) sesame seeds offer around 625 mg per 100 g.
• Sesamin and sesamolin (lignans): These unique phytoestrogens have antioxidant, anti-inflammatory, and potential hormonal-modulating effects. Sesamin has been shown in studies to inhibit pro-inflammatory enzymes and protect against lipid oxidation.
• Iron: Sesame seeds provide roughly 14 mg of iron per 100 g (as non-haem iron). Pairing them with vitamin C-rich foods improves absorption.
• Zinc: At around 7–8 mg per 100 g, sesame seeds support immune function, wound healing, and testosterone production.
• Healthy fats: About 50% of sesame seeds by weight is fat, predominantly oleic acid (omega-9) and linoleic acid (omega-6), supporting heart health and skin integrity.
• B vitamins: Sesame seeds are a good source of thiamine (B1), niacin (B3), and folate, supporting energy metabolism and cell division.

Health Benefits

The lignan content of sesame seeds is a key area of nutritional research. Sesamin and sesamolin are converted by gut bacteria into enterolactone and enterodiol, which are phytoestrogens with weak oestrogenic activity. Several observational studies have associated higher lignan intake with lower risk of hormone-sensitive cancers, particularly breast cancer in post-menopausal women, though the relationship is complex and requires more clinical investigation. Lignans also inhibit 5-lipoxygenase, an enzyme involved in the inflammatory cascade, contributing to systemic anti-inflammatory effects.

Sesame seeds support cardiovascular health through multiple pathways. The polyunsaturated fats help reduce LDL cholesterol when substituted for saturated fats, and sesamin has been shown in clinical trials to lower systolic blood pressure and reduce markers of oxidative stress. A 2011 randomised trial found that patients consuming 2.5 g of sesamin daily for four weeks showed significant reductions in blood pressure and oxidative stress biomarkers.

For bone health, the calcium in unhulled sesame seeds is bioavailable, though the presence of oxalates in the hull may slightly reduce absorption compared to dairy calcium. However, sesame seeds also provide magnesium and zinc — co-factors for bone mineralisation — which improve the net bone-protective effect. Tahini made from unhulled seeds is particularly useful for those who avoid dairy products and need reliable calcium sources.

Black sesame seeds have attracted attention in East Asian traditional medicine and recent nutritional studies for their notably higher anthocyanin content compared to white seeds. These pigments are potent antioxidants associated with protection against cognitive decline, cardiovascular disease, and certain cancers.

How to Use

• Toast before using: Toasting sesame seeds in a dry pan over medium heat for 2–3 minutes releases their oils and dramatically intensifies their nutty flavour. Watch them closely — they burn quickly. Toasted seeds work well as a garnish on rice, noodles, salads, and roasted vegetables.
• Make or use tahini generously: Tahini is one of the most nutritionally efficient ways to consume sesame seeds. Use it in salad dressings, drizzle over roasted cauliflower, blend into smoothies, or use as a dip with vegetables. Look for tahini made from unhulled seeds for maximum calcium content.
• Add to baked goods: Sprinkle sesame seeds on bread, crackers, and muffins before baking. They are a traditional topping for bagels, hamburger buns, and Middle Eastern ka'ak cookies.
• Black sesame paste: Black sesame seeds blended with a little honey and water make a traditional Chinese dessert paste (zhī ma jiàng) with a rich, deep flavour. It can also be stirred into oatmeal or yogurt.
• Store in an airtight container: Due to their high fat content, sesame seeds can go rancid. Store in a cool, dark pantry for up to three months, or refrigerate for up to six months to preserve flavour and prevent oxidation.