Nut, seedpod, bark.
Over the centuries, the natives of the Amazon rain forests have used the Brazil nut as a staple diet as well as currency for trade. The Brazil nut has several other utilities for the people of the Amazon rain forest. They use the empty seedpods or the shells as cups for drinking water and beverages, while some of them also make use of these vacant seedpods to contain small smoke-filled fires to drive away black flies. They also extract oil from the nuts that is used as a cooking oil, to lubricate high-precision machinery and also as a food for the livestock. In addition, the oil obtained from the nuts is used to produce hair-conditioning items, soaps as well as skin lotions. This oil possesses detergent as well as moisturizing features. Brazil nuts are also popular in countries other than those located in the Amazon rain forest and are generally available in the market all year round. People belong to the indigenous tribes of the Amazon rain forest region drink a herbal tea prepared by boiling the bark of Brazil nut to cure themselves of liver disorders. The traditional Brazilian herbal medication also includes drinking a tea prepared with the husks of the seedpods to alleviate stomach aches. In addition, as the Brazil nuts have a rich content of protein, vitamin E (a vital antioxidant) and monounsaturated fats, they are effective in combating a number of heart ailments. These nuts also contain an exceptional source of another antioxidant - selenium. It has been found that the amount of selenium contained in one Brazil nut is equivalent to more than 2,500 times of the mineral present in any other type of nuts. Selenium is a non-metallic ingredient that has proved to enhance mood and also the functioning of the brain. In addition, selenium also augments the blood circulation to the brain. The shape of Brazil nut is three-sided having a white tissues or flesh which encloses around 70 per cent fat and 17 per cent protein. For several centuries, the indigenous tribes residing in the Amazon rain forest region have depended on Brazil nuts as a vital and major staple diet. In fact, Brazil nuts were so imperative to these people that they have even used these nuts as trading goods within their community; much in the manner we use currency today. The indigenous tribes in the Amazon rain forest consume these nuts raw and sometimes pound them and blend the product into gruels. People living in the Brazilian region of the Amazon rain forest use the thorny stilt roots of Socratea palms to grind the nuts and then blend the grounded item with gruels to form a whitish pulp called 'leite de castanha'. Subsequently, the mash is mixed with manioc flour. The food prepared in this manner is rich in calories, protein and fat and serve as a valuable nutrient for majority of the indigenous people residing in the Amazon rain forests of South America. As the fresh Brazil nuts are very rich in oil content, they may be used as small candles to illuminate homes during the night. The rural indigenous tribes of the region extract the Brazil nut oil and use it for a number of purposes, including cooking oil, oil for lighting lamps, making soap as well as feeding their livestock. Similarly, the empty seedpods of the herb locally called 'monkey's pots' are used by the local tribes as cups to hold small smoky fires to repel black flies. In addition, these small wooden cups are also used to collect latex from the rubber plants and drinking water or other beverages. Moreover, the husks of these seedpods are used medicinally by the local people. According to the traditional Brazilian medicine, a tea prepared by boiling the husks in water is administered to people enduring stomach aches, while the bark of the tree is used to brew a formulation to treat liver diseases. Even in the United States, people use Brazil nuts and the oil extracted from them as a food. The oil extracted from Brazil nuts is transparent having a yellow color. It has a pleasing, sugary aroma and flavour. Brazil nut oil is excellent wispy oil that is perfect for dressing salads. Those who love salads may try using it with raspberry vinegar for delicious salad dressing. Moreover, Brazil nut oil is widely used in the manufacture of soaps, hair conditioning/ repair products and shampoos in South America. In fact, the use of Brazil nut oil in manufacturing the above mentioned products is fast becoming popular in the United States too. Precisely speaking, Brazil nut oil is an excellent hair conditioner that makes the hair silky, soft and glowing. In addition, hair conditioning products prepared with Brazil nut oil are also effective in restoring the dry and lifeless hair while repairing the split hair ends. Brazil nut oil is also a valuable raw material for the cosmetic manufacturers who use it to prepare various kinds of skin ointments and lotions that not only work to oil and dampen the skin, but also supplies the skin with antioxidants to ward of all types of disorders. Brazil nuts are the richest natural sources of selenium, a trace mineral, and this non-metallic element aids in preventing aridity of the skin, makes the skin soft, smooth and keeps it hydrated. Besides, this mineral possesses antioxidant properties that help us to avoid many diseases, especially cancer.
The Brazil nut tree can be found growing naturally all over the rain forests in the Amazon River basin in South America. Thus far, it has not been possible to naturalize this species of plant outside the Amazon rain forests. Generally, Brazil nut trees are not cultivated owing to its complicated fruit production process as well as the very sluggish pace of growth. Hence, nearly the entire fruit production of this tree is harvested wild in the rain forests of Amazon.
Not much research has been undertaken to find out the medicinal properties of Brazil nut since the fruit has been basically used as a general food for ages. Hence, it is not surprising that apart from finding that the fruit encloses selenium, not much has been found about Brazil nut's chemical composition. Any person using this fruit for remedial purpose does so only keeping in view that the Brazil nut has a rich content of selenium. In fact, selenium is actually a trace mineral present in our body and possesses cancer preventing, anti-cancer and antioxidant properties. It is considered to be especially useful for preventing as well as treating prostate cancer.
Chemical analysis of Brazil nut oil has found that it primarily encloses oleic, palmitic, linoleic and alpha linolenic acids along with tiny quantities of stearic and myristic acids as well as phytosterols. Apart from this, this fruit also provides protein and fat. At the same time, it is the natural source of maximum amount of selenium. In fact, a solitary Brazil nut contains more selenium than the U.S. Recommended Daily Allowance (RDA) for selenium. It may be noted that the proteins enclosed in Brazil nut possess very high amounts of sulfur-containing amino acids, such as methionine (around 18 per cent) and cysteine (approximately 8 per cent). They also contain very rich amounts of arginine, glutamic acid and glutamine. The amino acids, especially methionine, in Brazil nut actually augment the amalgamation of selenium and different minerals in the fruit capsule or pods. Apart from the compounds mentioned in this article earlier, Brazil nut also encloses cerium, antimony, europium, cesium, lanthanum, fatty acids, lutetium, scandium, samarium, tungsten, selenoprotein, tantalum and ytterbium.