Acai berries are harvested as food. In a study of three traditional Caboclo populations in the Amazon region of Brazil, acai palm was described as the most important plant species because the acai fruit makes up such a major component of diet (up to 42% of the total food intake by weight) and is economically valuable in the region (Murrieta et al., 1999).
The juice and pulp of acai fruits (Euterpe oleracea) are frequently used in various juice blends, smoothies, sodas, and other beverages. In northern Brazil, acai is traditionally served in gourds called "cuias" with tapioca and sometimes sugar. Acai has become a fad in southern Brazil where it is consumed cold as açaí na tigela ("acai in the bowl"), mostly mixed with granola - a fad where acai is considered as an energizer. Acai is also widely consumed in Brazil as an ice cream flavor or juice.
As acai deteriorates rapidly after harvest, its raw material is generally only available outside the immediate growing region as acai juice or acai fruit pulp that has been frozen, dried acai, or freeze-dried. However, several companies now manufacture acai juices, other health drinks, and sorbets made from acai berries, often in combination with other fruits.
The above information is from wikipedia: http://en.wikipedia.org/wiki/Acai
