This week, three Packaged Foods stocks are improving their overall rating on Portfolio Grader. Each of these rates an “A” (“strong buy”) or “B” overall (“buy”).

Cosan (NYSE:CZZ) ups its rating to a B (“buy”) this week after earning a C (“hold”) in the week before. Cosan is a global ethanol and sugar company in terms of production with low-cost, large-scale and integrated operations in Brazil. Shares of CZZ have increased 13.7% over the past month, better than the 2.8% increase the S&P 500 has seen over the same period of time. The stock has a trailing PE Ratio of 6.7. For more information, get Portfolio Grader’s complete analysis of CZZ stock.

Cal-Maine Foods (NASDAQ:CALM) is progressing from last week’s rating of B (“buy”) as the company improves to an A (“strong buy”) this week. Cal-Maine Foods produces, markets, and distributes shell eggs in the United States. Investors have pushed the stock price up 14.9% over the past month. For more information, get Portfolio Grader’s complete analysis of CALM stock.

This week, Zhongpin (NASDAQ:HOGS) pushes up from a C to a B rating. Zhongpin engages in the processing and distribution of meat and food products primarily in the People’s Republic of China. Wall Street has pushed the stock higher by 9.5% over the past month. The stock’s trailing PE Ratio is 8.3. For more information, get Portfolio Grader’s complete analysis of HOGS stock.

Louis Navellier’s proprietary Portfolio Grader stock ranking system assesses roughly 5,000 companies every week based on a number of fundamental and quantitative measures. Stocks are given a letter grade based on their results — with A being “strong buy,” and F being “strong sell.” Explore the tool here.