The food business is more competitive than ever, and General Mills, Inc. (NYSE: GIS) has felt the squeeze from a variety of sources. It wasn't prepared for the wave of natural and organic products hitting the market; it's facing competition from smaller, more nimble companies; and expenses like rising fuel costs are hurting its bottom line. In the fourth quarter of fiscal 2018, the company showed that it's starting to see benefits from strategic changes it's made over the last few years.