http://www.diagnose-me.com/cond/C47006.htmlCauses & Development
Immune responses can be depressed by various external influences including emotional stress, physical stressors such as inadequate sleep or athletic overtraining, environmental and occupational chemical exposure, UV and other types of radiation, common viral or bacterial infections, certain drug therapies, blood transfusions and surgery. Dietary habits also have an impact on immune response. Excessive fat, alcohol or refined sugar consumption or inadequate protein, calorie, vitamin, mineral or water intake fosters decreased immune performance as well. In addition, the biological state of aging counteracts immune function, particularly after age of 40.
Immune deficiencies are also attributed to acquired infections or diseases that target the immune system, such as AIDS, while others, particularly primary immunodeficiency diseases, are often due to genetic abnormalities. Not all primary immunodeficiency diseases are genetically determined, however. Some occur without a known cause. One of the most frequent immunodeficiency diseases, Common Variable Immunodeficiency (CVID), which includes hypogammaglobulinemia, adult-onset agammaglobulinemia, late-onset hypogammaglobulinemia and acquired agammaglobulinemia, usually occurs sporadically and has no clear pattern of inheritance.
Chronic and acute mobilization of immune defenses, induced by a variety of diseases and conditions, places undue stress on the immune system, weakening its capacity to deal effectively with infectious organisms and other immunological requirements elsewhere in the body. Such conditions include, but are not limited to, multiple sclerosis, fibromyalgia, autoimmune disorders in general, primary chronic polyarthritis, chronic candidiasis, cancer, neurodermatitis, ulcerative colitis, Crohn's disease, food and other allergies, Chronic Fatigue Syndrome (CFS) and chemical sensitivities.
Nutrient deficiency is a well-known cause of immune system malfunction. It has recently been demonstrated in an animal species is that nutrient deficiency in one generation can affect immune function in succeeding generations, even if they're not nutrient deficient. In that experiment pregnant mice were given a zinc-deficient diet. Their offspring had defective immune function, even though they and their mothers were fed a zinc-adequate diet as soon as they were born. Second and third generations of mice also had defective immune system function (although less severe), all while maintaining a zinc-adequate diet. "This study", the researchers said, "has important implications for public health and human welfare, as the consequences of fetal impoverishment may persist despite generations of nutritional supplementation. Dietary supplementation beyond the levels considered adequate might allow for more rapid or complete restoration of immunocompetence".