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In recent years, there has been conflicting information about fish. On the one hand, fish is consistently regarded as a terrific source of low-fat protein. On the other hand, there are serious concerns about mercury and other environmental impurities, and their effects on children, pregnant women and the elderly.
Dr. Roizen says you just have to remember a few great fish—tilapia, salmon, flounder, cod and mahi-mahi. "Those are the fish that have none of the toxic chemicals, none of the PCBs, and very low content of mercury." According to Dr. Roizen, you should eat a serving of these fish three times a week.