Yet again, let me quote from the Weston A. Price Foundation:
"Whole wheat is rich in nutrients. During the process of turning whole wheat into white flour, the B vitamins as well as vitamin E, calcium, zinc, copper, manganese, potassium and fiber are removed. In an attempt to replace some of the destroyed nutrients, minute amounts of synthetic nutrients are added back in to "fortify" or "enrich" the product. Take Spaghetti-O's for example. Right on the label it claims that Spaghetti-O's are an excellent source of eight essential nutrients, seven of which have been added through fortification. Obviously, Spaghetti-O's lack any real nutritional value, so food manufacturers attempt to add artificial nutritional value by fortifying processed junk foods with synthetic nutrients. The synthetic B-vitamins added back to the white flour are derived from coal tar and lead to imbalances within the body. This creates a deficiency in certain of the B-vitamins as the body works to correct the imbalance. Symptoms of a B-vitamin deficiency include: fatigue, depression, anxiety, irritability, poor memory, insomnia, heart palpitations and muscle tenderness."