Acai berries are harvested in the rainforests of Brazil, and are rapidly turning into the No. 1 superfood. The deep purple little berries grow on top of palm trees in the Amazon. They are claimed to be the best choice in weight-loss programmes, as well as giving increased energy, and work as a deep toxin cleanser in your body. Acai berries have a similar taste to chocolate. As far as we know today there are no side effects and they are completely natural. Outside of Brazil it is unlikely to find Acai berries, as they deteriorate very quickly after being harvested. Therefore they are mostly available in supplements and concentrated juices.