Sprouts plans to double its store count while boosting customer engagement.Sprouts Farmers Market (SFM 3.29%), which operates a chain of supermarkets focused on organic and natural food, has tumbled by more than 30% this year. Challenging year-over-year comparisons and Sprouts' forecast of lower comparable store sales growth rates for Q4 have weighted on the stock. That wiped out more than half of the roughly 800% gain in the stock during the past five years. Revenue and net income have continued to grow th ...