Açaí berries are the fruit of the açaí palms (Euterpe oleracea and Euterpe precatoria), which are native to the Amazon River basin. Açaí berries have been shown to have potent antioxidant and anti-inflammatory activities and to protect coronary arteries from damage following exposure to oxygen radicals.
Açaí berries are a good dietary source of vitamin A, as well as some calcium and fiber. Açaí­ berries also contain various anthocyanins (including cyanidin-3-O-rutinoside and cyanidin-3-glucoside) and carotenoids (accounting for its vitamin A content), several lignans, beta-sitosterol, homoorientin, taxifolin, isovitexin, procyanidin oligmers, vanillic acid, p-hydroxybenzoic acid, syringic acid, ferulic acid, and protocatechuic acid, most of which have been reported to have anti-cancer properties. Açaí berries contain high levels of fat compared to other berries, including oleic acid, palmitic acid, and linoleic acid.

Cancer-related effects of eating açaí berries

Açaí berries contain numerous compounds that could potentially contribute to protection against cancer. Açaí extracts have been found to greatly inhibit the proliferation human colon cancer cells and to inhibit proliferation and induce apoptosis in human leukemia cells in the laboratory. An anthocyanin-rich extract of açaí berries was found to exert antiproliferative and proapoptic effects against rat brain cancer cells, but the same extract had no impact on the growth of human estrogen receptor negative (ER-) breast cancer cells. One 2018 study reported that animals fed açaí extract survived longer than control animals in a rat model of carcinogen-induced breast cancer. However, more studies are needed to determine the effect of açaí­ berries on breast cancer.

Additional comments

Most açaí berry products marketed in the U.S. are produced in the Amazon region of Brazil. The berries themselves are highly perishable once harvested. Therefore, açaí­ berries normally are turned into a pulp (including the skins and flesh), freeze-dried, and made into a powder. This powder is exported to the U.S., where it is used to make açaí juice, açaí­ smoothies and açaí­ yoghurt. Dried berries and frozen açaí­ pulp also are available.
In Latin America, fresh açaí juice is a source of Chagas' Disease, a potentially deadly disease that can result in cardiac, gastrointestinal, and neurological damage. Chagas' Disease is caused by a parasite, which is transmitted to açaí berries by triatomine, an insect. Contamination is believed to be caused by triatomine stools on the fruit or the insects themselves inadvertently crushed during processing.
The conditions under which açaí berries are processed for export are much less likely to lead to contamination by the parasite than local Brazilian açaí­ juicing methods and there have been no reports in the U.S. of Chagas' Disease. Therefore, açaí­ berry products should be purchased organic. Products made from açaí­ powder appear to be safer than products marketed as "fresh" açaí­ foods.
Hearts of palm (palm hearts) are harvested from the same palms as açaí berries in the Amazon basin (other palm trees in Central and South America also are used). Hearts of palm are the undeveloped leaves of the palm (the bud). The palm hearts are collected and canned in the region before being exported. No information is available concerning hearts of palm and breast cancer.
Açaí­ berry-drug interactions, especially cytochrome P450 (CYP)-mediated interactions, may cause an enhancement or reduction in the efficacy of prescription drugs. Açaí berry products should not be consumed during chemotherapy.
Although açaí berries are marketed as a weight loss aid, we found no studies concerning the potential impact of consumption of açaí berries on weight loss.
Note that while we are continually searching for new evidence concerning this food, there is not much interest in it among cancer researchers so few recent or relevant studies are available.