Shares of Whole Foods (NASDAQ:WFMI) are up more than 30% from their lows this summer. Is there still time to buy? Will the Wild Oats acquisition lead to even healthier returns going forward? Can Whole Foods fend off growing competition from Wal-Mart (NYSE:WMT), Kroger (NYSE:KR), and Safeway (NYSE:SWY)? In this installment of "Missing Out," I ask Motley Fool contributor Tim Beyers.