The Food and Drug Administration is tearing into several Kind fruit and nut bars, blasting the company's claims they are healthy.Apparently there is a federal criterion for what is considered healthy, and Kind doesn't meet it, according to a recent FDA warning letter to the company.The agency singled out the labels for four Kind bars: almond and apricot, almond and coconut, peanut butter-dark chocolate and protein, and dark chocolate-cherry cashew and antioxidants.The agency took aim at several claims that the bars were "healthy," including that they were low in sodium and were a good source of fiber.