In recent years, evidence has accumulated that nuclear fission products in the diet appear to be the single most important cause of the rise in low birth weight, cancer, chronic diseases and drug-resistant infections. Both laboratory and epidemiological evidence will be presented that it is primarily damage to the immune system via the production of the oxygen free radicals produced by strontium-90 irradiating the bone marrow that dominates at low dose exposures due to dietary contamination.