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As for concerns about vitamin A, these stem from studies in which moderate doses of synthetic vitamin A were found to cause problems and even contribute to birth defects.
Of the last group of rats, the ones receiving liver, three swam for 63, 83 and 87 minutes.The other nine rats in this group were still swimming vigorously at the end of two hours when the test was terminated.Something in the liver had prevented them from becoming exhausted.Textbooks on nutrition written before the Second World War recommended that pregnant women eat liver frequently, yet today pregnant women are told to avoid this extremely nutritious food. it has high levels of retinol, a vitamin-A derivative that can cause birth defects.” A good recommendation for liver is one 100-gram serving of beef, lamb, bison or duck liver (about 4 ounces) once or twice a week, providing about 50,000 IU vitamin A per serving.Don’t eat beef liver, cautions Organic Style magazine in a February 2005 article on diets for pregnant women, “. Chicken liver, which is lower in vitamin A, may be consumed more frequently.