What happened Investors lost their appetite for Brinker International (NYSE: EAT) stock today after the operator of restaurant chains Chili's and Maggiano's Little Italy was downgraded by JPMorgan Chase . So what The Wall Street titan cut its rating on Brinker from "overweight" to "neutral," saying that the casual-dining chain operator had "exhausted its ability to engineer" shareholder gains. Indeed, much of the restaurant industry, including casual dining, has struggled lately as food deflation has made supermarket prices cheaper, rising labor costs have cut into profits, and competition has increased.