Hedge fund Jana Partners added a fifth nominee to its slate for Whole Foods Market Inc's (WFM.O) board, as it heaps up the pressure on the upscale grocer to boost profits and lift its sagging stock. The activist investor nominated Celeste Clark, who once served as chief sustainability officer at Kellogg Co (K.N), to join the slate that already includes former CEOs of Gap Inc (GPS.N) and Harris Teeter Supermarkets as well as a stock analyst. (bit.ly/2qxnVJk) Jana, which currently owns an 8.2 percent stake in the Whole Foods, has been urging the company to shakeup its management, ...