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The Tupi people were one of the main ethnic groups of Brazilian indigenous people. Scholars believe they first settled in the Amazon rainforest, but 2,900 years ago they started to spread southward and gradually occupied the Atlantic coast.
The Tupi people inhabited almost all of Brazil's coast when the Portuguese first arrived there. In 1500, their population was estimated at 1 million people, nearly equal to the population of Portugal at the time. They were divided into tribes, each tribe numbering from 300 to 2,000 people. Some examples of these tribes are: Tupiniquim, Tupinambá, Potiguara, Tabajara, Caetés, Temiminó, Tamoios. The Tupi utilised agriculture and therefore satisfied a Neolithic condition. They grew cassava, corn, sweet potatoes, beans, peanuts, tobacco, squash, cotton, and many others. There was not a unified Tupi identity despite the fact that they were a single ethnic group that spoke a common language.
European colonization 
From the 16th century onward the Tupi, like other natives from the region, were assimilated, enslaved, or simply exterminated by Portuguese settlers and Bandeirantes (colonial Brazil scouts), nearly leading to their complete annihilation, with the exception of a few isolated communities. The remnants of these tribes are today confined to Indian reservations or acculturated to some degree into the dominant society.
The Tupi were divided into several tribes which were constantly engaged in war with one another. In these wars the Tupi normally tried to capture their enemies to later kill them in cannibalistic rituals. The warriors captured from other Tupí tribes were eaten as they believed they were absorbing their strength, thus in fear of absorbing weakness, they only sacrificed warriors perceived to be strong and brave. For the Tupí warriors, even when prisoners, it was a great honor to die valiantly during battle or to display courage during the festivities leading to his sacrifice. The Tupí have also been documented to eat the remains of dead relatives as a form of honoring them.
The practice of cannibalism among the Tupí was made famous in Europe by Hans Staden, a German soldier and mariner who was captured by the Tupí in 1552. In his account published in 1557, he tells that the Tupí carried him to their village where he claimed he was to be devoured at the next festivity. There, he allegedly won the friendship of a powerful chief, whom he cured of a disease, and his life was spared.
Cannibalistic rituals amongst Tupí and other tribes in Brazil decreased steadily after European contact and religious intervention. When Cabeza de Vaca, a Spanish conquistador arrived in Santa Catarina in 1541, for example, he attempted to ban cannibalistic practices in the name of the King of Spain.
Due to the fact that our understanding of Tupí cannibalism relies solely on primary source accounts of primarily European writers, the very existence of cannibalism is widely disputed in academia. William Arens seeks to discredit Staden's and other writers' accounts of cannibalism in his book The Man-Eating Myth: Anthropology & Anthropophagy, where he claims that when concerning the Tupinambá, “rather than dealing with an instance of serial documentation of cannibalism, we are more likely confronting only one source of dubious testimony which has been incorporated almost verbatim into the written reports of others claiming to be eyewitnesses.”
Race-mixing and Cunhadismo 
Many indigenous peoples were important for the formation of the Brazilian people, but the main group was the Tupi. When the Portuguese explorers arrived in Brazil in the 16th century, the Tupi were the first Amerindian group to have contact with them. Soon, a process of miscegenation between Portuguese settlers and indigenous women started. The Portuguese colonists rarely brought women, making the Indian women the "breeding matrix of the Brazilian people". When the first Europeans arrived, the phenomenon of "cunhadismo" (from Portuguese cunhado, "brother in law") began to spread by the colony. Cunhadismo was an old Indian tradition of incorporating strangers to their community. The Indians offered the Portuguese an Indian girl as wife. Once he agreed, he formed a bond of kinship with all the Indians of the tribe. Polygyny, a common practice among South American Indians, was quickly adopted by European settlers. This way, a single European man could have dozens of Indian wives (temericós).
Cunhadismo was used as recruitment of labour. The Portuguese could have many temericós and thus a huge number of Indian relatives who were induced to work for him, especially to cut pau-brasil and take it to the ships on the coast. In the process, a large mixed-race (mameluco) population was formed, which in fact occupied Brazil. Without the practice of cunhadismo, the Portuguese colonization was impractical. The number of Portuguese men in Brazil was very small and Portuguese women were even fewer in number. The proliferation of mixed-race people in the wombs of Indian women provided for the occupation of the territory and the consolidation of the Portuguese presence in the region.
Influence in Brazil 
Although the Tupi population was largely exterminated because of slavery or because of European diseases to which they had no resistance, a large population of maternal Tupi ancestry occupied much of Brazilian territory, taking the ancient traditions to several points of the country. Darcy Ribeiro wrote that the features of the first Brazilians were much more Tupi than Portuguese, and even the language that they spoke was a Tupi-based language, named Nheengatu or Língua Geral, a lingua franca in Brazil until the 18th century. The region of São Paulo was the biggest in the proliferation of Mamelucos, who in the 17th century under the name of Bandeirantes, spread throughout Brazilian territory, from the Amazon rainforest to the extreme South. They were responsible for the major expansion of the Iberian culture in the interior of Brazil. They acculturated the Indian tribes who lived isolated, and took the language of the colonizer, which was not Portuguese yet, but Nheengatu itself, to the most inhospitable corners of the colony. Interestingly, Nheengatu is still spoken in certain regions of the Amazon, although the Tupi-speaking Indians did not live there. The Nheengatu language, as in other regions of the country, was introduced there by Bandeirantes from São Paulo in the 17th century. The way of life of the Old Paulistas could almost be confused with the Indians. Within the family, only Nheengatu was spoken. Agriculture, hunting, fishing and gathering of fruits were also based on Indian traditions. What differentiated the Tupi from the Old Paulistas was the use of clothes, salt, metal tools, weapons and other European items.
When these areas of large Tupi influence started to be integrated in the market economy, Brazilian society gradually started to lose its Tupi characteristics. The Portuguese language became dominant and Língua Geral virtually disappeared. The rustic Indian techniques of production were replaced by European ones, in order to elevate the capacity of exportation. From Tupi, Brazilian Portuguese absorbed many words. Some examples of Portuguese words that came from Tupi are: mingau, mirim, soco, cutucar, tiquinho, perereca, tatu. The names of several local fauna – such as arara ("macaw"), jacaré ("South American alligator"), tucano ("toucan") – and flora – e.g. mandioca ("manioc") and abacaxi ("pineapple") – are also derived from the Tupi language. A number of places and cities in modern Brazil are named in Tupi (Itaquaquecetuba, Pindamonhangaba, Caruaru, Ipanema). Anthroponyms include Ubirajara, Ubiratã, Moema, Jussara, Jurema, Janaína. Tupi surnames do exist, but they do not imply any real Tupi ancestry; rather they were adopted as a manner to display Brazilian nationalism.
The Tupinambá tribe is fictitiously portrayed in Nelson Pereira dos Santos' satirical 1971 film, How Tasty Was My Little Frenchman (Como Era Gostoso o Meu Francês); its name is also adapted by science (as Tupinambis) for the tegus, arguably the best-known lizards of Brazil.
A large offshore Tupi oil field discovered off the coast of Brazil in 2006 was named in honor of the Tupi people.
The Guaraní are a different native group which inhabits southern Brazil, Uruguay, Paraguay and northern Argentina and speaks the distinct Guaraní languages, but these are in the same language family as Tupi.
Notable Tupí people 
- Catarina Paraguaçu, 1528—1586
See also 
- Saída dos tupi-guaranis da Amazônia pode ter ocorrido há 2.900 anos
- Darcy Ribeiro – O Povo Brasileiro, Vol. 07, 1997 (1997), pp. 28 to 33; 72 to 75 and 95 to 101."
- Um alemão na terra dos canibais
- Agnolin, Adone. O apetite da antropologia. São Paulo, Associação Editorial Humanitas, 2005. P. 285. http://books.google.com/books?ei=FNcvSteyGZiCyATy3rmzCA&client=firefox-a&id=PV9aAAAAMAAJ&dq=Ant%C3%B4nio+Carlos+Jobim%3A+uma+biografia&q=postura+nacionalista&pgis=1#search_anchor
- Museu de Arte Origens
- (New York : Oxford University Press, 1979; ISBN 0-19-502793-0)
- Cabral, Sérgio. Antonio Carlos Jobim: uma Biografia. Petrópolis, Lumiar, 1997. P. 39. http://books.google.com/books?ei=FNcvSteyGZiCyATy3rmzCA&client=firefox-a&id=PV9aAAAAMAAJ&dq=Ant%C3%B4nio+Carlos+Jobim%3A+uma+biografia&q=postura+nacionalista&pgis=1#search_anchor