Research has shown that eating fish does not increase the risk for Alzheimer’s disease. Mercury levels in fish can be harmful to people. But recent research has shown that mercury levels don’t necessarily lead to Alzheimer’s disease: “People who ate seafood at least once a week showed higher levels of mercury in the brain than those who ate less. But for people with a genetic risk factor for Alzheimer’s, called ApoE4, eating more fish also showed lower amounts of harmful proteins in their brain.” These findings do not mean that fish is the cure for Alzheimer’s, but they do show that eating fish will not damage the brain and increase the risk for the disease.