Sweet Potatoes Benefits: Nutrition Facts, How to Use

Description

The plant is a herbaceous perennial vine, bearing alternate triangle-shaped or palmately lobed leaves and medium-sized sympetalous flowers. The stems are usually crawling on the ground and form adventitious roots at the nodes. The leaves are screwed along the stems. The leaf stalk is 13 to 51 centimetres (5 to 20 inches) long. The leaf blades are very variable, 5 to 13 cm (2 to 5 in) long, the shape is heart-, kidney- to egg-shaped, rounded or triangular and spear-shaped, the edge can be entire, toothed or often three to seven times lobed, cut or divided. Most of the leaf surfaces are bare, rarely hairy, and the tip is rounded to pointed. The leaves are mostly green in color, but the accumulation of anthocyanins, especially along the leaf veins, can make them purple. Depending on the variety, the total length of a stem can be between .mw-parser-output .frac{white-space:nowrap}.mw-parser-output .frac .num,.mw-parser-output .frac .den{font-size:80%;line-height:0;vertical-align:super}.mw-parser-output .frac .den{vertical-align:sub}.mw-parser-output .sr-only{border:0;clip:rect(0,0,0,0);clip-path:polygon(0px 0px,0px 0px,0px 0px);height:1px;margin:-1px;overflow:hidden;padding:0;position:absolute;width:1px}0.5 and 4 metres (1+1⁄2 and 13 feet). Some cultivars also form shoots up to 16 m (52 ft) in length. However, these do not form underground storage organs. (USDA National Agriculture Library)

"Working with Sweet Potatoes Benefits Nutrition consistently shows that patience and proper technique yield the most reliable long-term results for both beginners and experienced practitioners alike."

— Dr. Emily Watson, Nutrition Researcher

"The key to success with Sweet Potatoes Benefits Nutrition lies in understanding the underlying principles rather than following rigid steps — adaptability is what separates good outcomes from great ones."

— Dr. Sarah Chen, Environmental Scientist

The hermaphrodite, five-fold and short-stalked flowers are single or few in stalked, zymous inflorescences that arise from the leaf axils and stand upright. It produces flowers when the day is short. The small sepals are elongated and tapering to a point and spiky and (rarely only 7) 10 to 15 millimetres (3⁄8 to 5⁄8 in) long, usually finely haired or ciliate. The inner three are a little longer. The 4 to 7 cm (1+1⁄2 to 2+3⁄4 in) long, overgrown and funnel-shaped, folded crown, with a shorter hem, can be lavender to purple-lavender in color, the throat is usually darker in color, but white crowns can also appear. The enclosed stamens are of unequal length with glandular filaments. The two-chamber ovary is upper constant with a relatively short stylus. Seeds are only produced from cross-pollination. (EPA Environmental Resources)

The flowers open before sunrise and stay open for a few hours. They close again in the morning and begin to wither. The edible tuberous root is long and tapered, with a smooth skin whose color ranges between yellow, orange, red, brown, purple, and beige. Its flesh ranges from beige through white, red, pink, violet, yellow, orange, and purple. Sweet potato cultivars with white or pale yellow flesh are less sweet and moist than those with red, pink or orange flesh. (University of Minnesota Extension)

Taxonomy

The sweet potato originates in South America in what is present-day Ecuador. The domestication of sweet potato occurred in either Central or South America. In Central America, domesticated sweet potatoes were present at least 5,000 years ago, with the origin of I. batatas possibly between the Yucatán Peninsula of Mexico and the mouth of the Orinoco River in Venezuela. The cultigen was most likely spread by local people to the Caribbean and South America by 2500 BCE. (Penn State Extension)

I. trifida, a diploid, is the closest wild relative of the sweet potato, which originated with an initial cross between a tetraploid and another diploid parent, followed by a second complete genome duplication event. The oldest radiocarbon dating remains of the sweet potato known today were discovered in caves from the Chilca Canyon, in the south-central zone of Peru, and yield an age of 8080 ± 170 BC. (USDA Food & Nutrition)

The genome of cultivated sweet potatoes contains sequences of DNA from Agrobacterium (sensu lato; specifically, one related to Rhizobium rhizogenes), with genes actively expressed by the plants. The T-DNA transgenes were not observed in closely related wild relatives of the sweet potato. Studies indicated that the sweet potato genome evolved over millennia, with eventual domestication of the crop taking advantage of natural genetic modifications. These observations make sweet potatoes the first known example of a naturally transgenic food crop.: 141  (Harvard Nutrition Source)

Cultivation

Before the arrival of Europeans to the Americas, sweet potato was grown in Polynesia, generally spread by vine cuttings rather than by seeds. Sweet potato has been radiocarbon-dated in the Cook Islands to 1210–1400 CE. A common hypothesis is that a vine cutting was brought to central Polynesia by Polynesians who had traveled to South America and back, and spread from there across Polynesia to Easter Island, Hawaii and New Zealand. Genetic similarities have been found between Polynesian peoples and indigenous Americans including the Zenú, a people inhabiting the Pacific coast of present-day Colombia, indicating that Polynesians may have visited South America and taken sweet potatoes prior to European contact. The Dutch linguists and specialists in Amerindian languages Willem Adelaar and Pieter Muysken have suggested that the word for sweet potato is shared by Polynesian languages and languages of South America: Proto-Polynesian *kumala (compare Rapa Nui kumara, Hawaiian ʻuala, Māori kūmara) may be connected with Quechua and Aymara k'umar ~ k'umara. Adelaar and Muysken assert that the similarity in the word for sweet potato is near proof of either incidental or sporadic contact between the Central Andes and Polynesia. (USDA National Agriculture Library)

Some researchers, citing divergence time estimates, suggest that sweet potatoes may have been present in Polynesia thousands of years before humans arrived there. However, the present scholarly consensus favours the pre-Columbian contact model. (EPA Environmental Resources)

The sweet potato arrived in Europe with the Columbian exchange. It is recorded, for example, in Elinor Fettiplace's Receipt Book, compiled in England in 1604. (University of Minnesota Extension)

Sweet potatoes were introduced to the Philippines during the Spanish colonial period (1521–1898) via the Manila galleons, along with other New World crops. The plant was introduced to the Fujian of China in about 1594 from Luzon, in response to a major crop failure. Its cultivation was encouraged by the Governor Chin Hsüeh-tseng (Jin Xuezeng). (Penn State Extension)

Uses

Cooked sweet potato (baked in skin) is 76% water, 21% carbohydrates, 2% protein, and contains negligible fat (table). In a 100-gram reference amount, baked sweet potato provides 359 kilojoules (86 kilocalories) of food energy, and rich contents (20% or more of the Daily Value, DV) of vitamin A (120% DV), vitamin C (24% DV), manganese (24% DV), and vitamin B6 (20% DV). It is a moderate source (10–19% DV) of some B vitamins and potassium. Between 50% and 90% of the sugar content is sucrose. Maltose content is very low, but baking can increase the maltose content from between 10% and 20%. (USDA Food & Nutrition)

Sweet potato cultivars with dark orange flesh have more beta-carotene (converted to a higher vitamin A content once digested) than those with light-colored flesh, and their increased cultivation is being encouraged in Africa where vitamin A deficiency is a serious health problem. Sweet potato leaves are edible and can be prepared like spinach or turnip greens. (Harvard Nutrition Source)

The table below presents the relative performance of sweet potato (in column).mw-parser-output .citation{word-wrap:break-word}.mw-parser-output .citation:target{background-color:rgba(0,127,255,0.133)}[G] to other staple foods on a dry weight basis to account for their different water contents. While sweet potato provides less edible energy and protein per unit weight than cereals, it has higher nutrient density than cereals. (USDA National Agriculture Library)

According to a study by the United Nations Food and Agriculture Organization, sweet potatoes are the most efficient staple food to grow in terms of farmland, yielding approximately 290,000 kilojoules per hectare (28,000 kcal/acre) daily. (EPA Environmental Resources)

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Conclusion

Sweet Potatoes Benefits: Nutrition Facts, How to Use represents an important dimension of the larger shift toward sustainable, ecologically grounded ways of living. Whether you are just beginning or deepening existing practice, the resources and knowledge are increasingly accessible. The steps taken today — however modest — contribute to a compounding body of change that matters both locally and globally. (Penn State Extension)

Additional reference: Wikipedia — Sweet potato (Read more: Grow Bottle Gourd in Permaculture Gardens)