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It is especially critical that you avoid processed meats such as frankfurters, bologna, salami, lunch meat, beef jerky, smoked fish, bacon, sausage, ham, pepperoni, SPAM and others that are preserved with nitrites. Why? Because this chemical is a potent anti-immunity, cancer-causing chemical. When possible, reach for meats that are nitrite-free, which does include certain brands of hot dogs, bacon, sausage and ham among others.
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Michael Savage (Diseases without Borders: Boosting Your Immunity Against Infectious Diseases from the Flu and Measles to Tuberculosis)