Roasting nuts and seeds does not significantly change their nutritional value, and claims that roasting nuts changes fat composition or reduces vitamin E are untrue, according to Karen Collins, M.S., R.D., C.D.N., of the American Institute for Cancer Research. Either one is a good source of nutrients so just choose the variety you enjoy more. . . . . Raw nuts have the potential danger of carrying illness-causing bacteria. Salmonella has been reported from eating raw almonds and pistachio nuts. . . . There is no evidence that roasted, blanched or other heat-treated nuts carry the risk of contamination with salmonella, according to the Centers for Disease Control and Prevention.