Some tumors have no symptoms until they are quite large and then cause a serious, rapid decline in health. Other tumors may have symptoms that develop slowly. A common initial symptom of a brain tumor is headaches. Often, they don't respond to the usual headache remedies.
Acai berries are widely touted as a so-called superfood, with proponents claiming that they are helpful for a variety of health concerns, including arthritis, weight loss, high cholesterol, erectile dysfunction, skin appearance, detoxification and general health.
The link below is to one of the better articles on Acai and it has some nice photos of Acai berries (as I do not have any). Below you can see some Euterpe precatoria (aka the Forest Acai Palm) fruits which supposedly have even a higher antioxidant concentration than Euterpe oleracea fruits and look nearly identical.