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You can test IgG and IgE allergies via blood tests, and the results may be surprising. You may learn you’re allergic to “health foods.” If you eat citrus fruits for vitamin C, but the test says you’re allergic to them, you’re doing yourself more harm than good. If your results say you have an IgG reaction to lettuce or green tea, it’s just as critical to avoid those foods as it is to avoid the foods you have an IgE response to, such as cashews, dairy, or peanuts. It may not result in immediate s