However, experts still think diets rich in fish could reduce the chances of getting the disease or prevent it progressing from an early stage. Researchers in the U.S. carried out two investigations into DHA, an omega-3 fatty acid found in oily fish.
Previous studies have indicated that fish oil rich in omega-3 can protect the brain from age-related dementia, but Dr. Joseph Quinn, from Oregon Health and Sciences University, told the International Conference on Alzheimer's Disease in Vienna, "These results do not support the routine use of DHA for patients with Alzheimer's."