Areca nut

Areca catechu is a slender, unbranched palm that grows 10 to 20 metres tall, with a crown of feathery fronds and clusters of orange-red fruits about the size of a small egg. Inside the fibrous husk is a single hard, round to conical seed, 2 to 4 cm across, with a marbled brown and white interior.

The seeds are sold fresh, sliced, dried, boiled or cured, and used as the key ingredient in betel quid, usually wrapped in a betel leaf with slaked lime and sometimes tobacco and spices. The taste is astringent and bitter, and the seed contains the stimulant alkaloid arecoline. The name betel nut is a misnomer, since betel is the leaf of a pepper vine, Piper betle.

The areca palm is believed to be native to Southeast Asia and the western Pacific, possibly the Malay Archipelago and Melanesia, and has been cultivated for thousands of years across South and Southeast Asia and the Pacific islands. Archaeological finds of areca nut chewing remains date back several thousand years in the region.

The word areca comes through Portuguese from Malayalam adakka, and catechu is a name from a Malay word for another plant, mistakenly attached because the nut was once thought to be the source of catechu extract. Pinang, the Malay name, gave Penang its name.

Areca nut chewing is one of the oldest and most widespread psychoactive habits of the Old World. Chewing betel quid has been part of hospitality, courtship, religious ritual and marriage across India, Sri Lanka, Myanmar, Thailand, Malaysia, Indonesia, the Philippines, Taiwan, China and many Pacific islands, with offerings of areca and betel leaf presented at weddings and temples.

Traders spread the habit from Asia over land and sea, and Portuguese and Arab writers described it in the 16th century. In many societies, serving paan became a sign of respect, and ornate containers and spittoons developed. Colonial and post-colonial economies relied on areca trade, and India is today the largest producer and consumer.

In modern times, public health research has shown the harm of the habit. The International Agency for Research on Cancer classified areca nut as carcinogenic to humans, and the World Health Organization and national governments have run campaigns and restrictions, particularly where commercial packaged products, such as gutka, have spread among young people. Despite this, the practice remains deeply embedded culturally, which makes control difficult.

The main use is chewing, as sliced or whole nut in betel quid or as manufactured sachets. It is offered in rituals and ceremonies across Asia and the Pacific. In traditional medicine, dried seeds were used in Chinese and Ayurvedic preparations, including as a worming agent in people and animals, though these uses are discouraged given the risks.

Other uses include dyes from the nut and fibres from the husk, and the palm is also planted as an ornamental.

Chewing areca gives a mild stimulant effect, warmth and sense of alertness from arecoline, which explains its social popularity. However, the evidence on health harm is strong: it is linked to oral submucous fibrosis, oral and oesophageal cancers, gum disease, addiction, and metabolic and cardiovascular risks. There is no established health benefit from chewing areca nut, and traditional medicinal claims are not supported by modern evidence.