Salvia hispanica, commonly known as chia, is a species of flowering plant in the mint family, Lamiaceae, native to central and southern Mexico and Guatemala. The 16th-century Codex Mendoza provides evidence that it was cultivated by the Aztec in pre-Columbian times; economic historians have suggested it was as important as maize as a food crop. It is still used in Paraguay, Bolivia, Argentina, Mexico and Guatemala, sometimes with the seeds ground or with whole seeds used for nutritious drinks and as a food source.
It is one of two plants known as chia, the other being Salvia columbariae, which is more commonly known as the golden chia.
Chia is an annual herb growing up to 1.75 m (5.7 ft) tall, with opposite leaves that are 4–8 cm (1.6–3.1 in) long and 3–5 cm (1.2–2.0 in) wide. Its flowers are purple or white and are produced in numerous clusters in a spike at the end of each stem. Chia is hardy from USDA Zones 9-12. Many plants cultivated as S. hispanica are actually S. lavandulifolia.
Chia is grown commercially for its seed, a food that is rich in omega-3 fatty acids, since the seeds yield 25–30% extractable oil, including α-linolenic acid (ALA). Of total fat, the composition of the oil can be 55% ω-3, 18% ω-6, 6% ω-9, and 10% saturated fat.
Chia seeds are typically small ovals with a diameter of about 1 mm (0.039 in). They are mottle-colored with brown, gray, black and white. The seeds are hydrophilic, absorbing up to 12 times their weight in liquid when soaked. While soaking, the seeds develop a mucilaginous gel-like coating that gives chia-based beverages a distinctive texture.
Chia seed is traditionally consumed in Mexico, and the southwestern United States, but is not widely known in Europe. Chia (or chian or chien) has mostly been identified as Salvia hispanica L. Today, chia is grown commercially in its native Mexico, and in Bolivia, Argentina, Ecuador, Nicaragua, Guatemala, and Australia. In 2008, Australia was the world's largest producer of chia. A similar species, Salvia columbariae or golden chia, is used in the same way but is not grown commercially for food. Salvia hispanica seed is marketed most often under its common name "chia", but also under several trademarks.
Nutrient content and food uses
According to the USDA, a one ounce (28 gram) serving of chia seeds contains 9 grams of fat, 5 milligrams of sodium, 11 grams of dietary fiber, 4 grams of protein, 18% of the recommended daily intake of calcium, 27% phosphorus and 30% manganese. These nutrient values are similar to other edible seeds, such as flax or sesame.
Preliminary health research
Although preliminary research indicates potential for health benefits from consuming chia seeds, this work remains sparse and inconclusive.
One pilot study found that 10 weeks ingestion of 25 grams per day of milled chia seeds, compared to intact seeds, produced higher blood levels of alpha-linolenic acid and eicosapentaenoic acid, an omega-3 long-chain fatty acid considered good for the heart, while having no effect on inflammation or disease risk factors.
|Nutritional value per 100 g (3.5 oz)|
|Energy||2,034 kJ (486 kcal)|
|Dietary fiber||34.4 g|
|Vitamin A equiv.||
|Percentages are roughly approximated using US recommendations for adults.
Source: USDA Nutrient Database
S. hispanica is described and pictured in the Mendoza Codex and the Florentine Codex, sixteenth century Aztec codices created between 1540 and 1585. Both describe and picture Salvia hispanica and its usage by the Aztec. The Mendoza Codex indicates that the plant was widely cultivated and given as tribute in 21 of the 38 Aztec provincial states. Economic historians suggest that it was a staple food that was as widely used as maize.
Aztec tribute records from the Mendoza Codex, Matrícula de Tributos, and the Matricula de Huexotzinco (1560)—along with colonial cultivation reports and linguistic studies—give detail to the geographic location of the tributes, and provide some geographic specificity to the main S. hispanica growing regions. Most of the provinces grew the plant, except for areas of lowland coastal tropics and desert. The traditional area of cultivation was in a distinct area that covered parts of north-central Mexico south to Nicaragua. A second and separate area of cultivation, apparently pre-Columbian, was in southern Honduras and Nicaragua.
Decorative and novelty uses
In the United States, the first substantial wave of chia seed sales were tied to Chia Pets in the 1980s. These "pets" come in the form of clay figures that serve as a base for a sticky paste of chia seeds; the figures are then watered and the seeds sprout in a form suggesting the figure's fur. About 500,000 chia pets a year are sold in the US as novelties or house plants.
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- Cahill, Joseph P. (2003). "Ethnobotany of Chia, Salvia hispanica L. (Lamiaceae)". Economic Botany 57 (4): 604–618. doi:10.1663/0013-0001(2003)057[0604:EOCSHL]2.0.CO;2.
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- Stephanie Strom (November 23, 2012). "30 Years After Chia Pets, Seeds Hit Food Aisles". New York Times. Retrieved 26 November 2012. "Whole and ground chia seeds are being added to fruit drinks, snack foods and cereals and sold on their own to be baked into cookies and sprinkled on yogurt. ..."
- Anderson, A.J.O. and Dibble, C.E. "An Ethnobiography of the Nahuatl", The Florentine Codex, (translation of the work by Fr. Bernardino de Sahagún), Books 10-11, from the Period 1558-1569
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- USDA SR-21 Nutrient Data (2010). "Nutrition facts for dried chia seeds, one ounce". Conde Nast, Nutrition Data.
- Chia: The Ord Valley's new super crop
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- USDA SR-21 Nutrient Data (2010). "Nutrition Facts and Analysis for Seeds, sesame seed kernels, dried (decorticated)". Conde Nast, Nutrition Data. Retrieved 29 November 2010.
- The European Union, "Commission Decision of 13 October 2009 authorising the placing on the market of Chia seed(Salvia hispanica) as a novel food ingredient under Regulation (EC) No 268/97 of the European Parliament and of the Council" (L294/14) 2009/827/EC pp. 14-15 (November 11, 2009)
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- Stephanie Strom (November 23, 2012). "30 Years After Chia Pets, Seeds Hit Food Aisles". New York Times. Retrieved 26 November 2012. "significantly more alpha-linolenic acid in omega-3 reached the bloodstream and was converted into eicosapentaenoic acid, a long-chain fatty acid considered good for the heart ..."
- Nieman DC, Gillitt N, Jin F, Henson DA, Kennerly K, Shanely RA, Ore B, Su M, Schwartz S (2012). "Chia seed supplementation and disease risk factors in overweight women: a metabolomics investigation". J Altern Complement Med 18 (7): 700–8. doi:10.1089/acm.2011.0443. PMID 22830971. Retrieved 14 May 2014.
- Cahill 2003, p. 605
- "A second apparently pre-Columbian cultivation area is known in southern Honduras and Nicaragua."Jamboonsri, Watchareewan; Phillips, Timothy D.; Geneve, Robert L.; Cahill, Joseph P.; Hildebrand, David F. (2011). "Extending the range of an ancient crop, Salvia hispanica L.—a new ω3 source". Genetic Resources and Crop Evolution (Springer). Online First. doi:10.1007/s10722-011-9673-x.
- Chia Pet | Arts & Culture | Smithsonian Magazine. Smithsonianmag.com. Retrieved on 2014-04-26.