NEW YORK (AP) — A string of recent cyberattacks and data breaches involving the systems of major retailers have started affecting shoppers. United Natural Foods, a wholesale distributor that supplies Whole Foods and other grocers, said this week that a breach of its systems was disrupting its ability to fulfill orders — leaving many stores without certain items. In the U.K., consumers could not order from the website of Marks & Spencer for more than six weeks — and found fewer in-store options after hackers targeted the British clothing, home goods and food retailer.