Cyrena Lee, who said she shops at Whole Foods often, outside a store in New York, on Oct. 30. Even as sales of organic and natural products are taking off, the share price of Whole Foods has fallen 50 percent from its high this year, as investors worry about its prices and more competition. A Whole Foods employee with a cart full of purchases in New York on Oct. 30. Even as sales of organic and natural products are taking off, the share price of Whole Foods has fallen 50 percent from its high this year, as investors worry about its prices and more competition.