Acai is a berry native to South America that is pretty healthy, but hasn't been scientifically proven to be any healthier than many other types of berries, such as blueberries, raspberries, or blackberries. However, since many gullible people have never heard of acai berries, they jump at ridiculous advertisements which claim their acai berry extracts will help them lose weight. Incidentally, many of the companies selling these extracts are pyramid schemes.

Acai is a Brazilian berry original from the Amazon Region that is considered to be one of nature's most complete and healthy foods.
The history of the berry from the Brazilian Amazon that is changing the concept of healthy food. Acai (açaí - a-sigh-ee) is a palm tree that grows in the North of Brazil. It is known by the native people (indigenas) as "içá-çai", which means “fruit that cries”. The Acai tree can be found all over the Amazonia region. To make Acai Roots, juice is extracted from the pulp of the skin of the seed. No trees are harmed in the process. For hundreds of years, acai (açaí) has been a traditional food of the native people of the Amazon – and part of its folklore, finding its way into legend as well as onto the table. Once upon a time, there was an Amazon Indian girl named Iaca, whose father was the tribal chief. His tribe had grown so large that there wasn’t enough food to go around. So, the chief decreed that all newborn babies must be killed. When Iaca, his own daughter, bore a child, the chief had his decree carried out. Iaca mourned her baby’s death alone in her hut for days. Then she thought she heard a baby crying. When she went outside in search of the baby, she saw a palm tree shooting up from the earth, covered in fruit. Full of despair, she lay down under the tree and died. The next day, the tribe found Iaca’s body under the new tree. The tree’s fruit satisfied their hunger and renewed their energy, and the chief lifted his harsh decree, decla...