The overall ratings of three Packaged Foods stocks are down on Portfolio Grader this week. Each of these rates a “D” (“sell”) or “F” overall (“strong sell”).

This week, Lifeway Foods (NASDAQ:LWAY) falls to a D (“sell”), worse than last week’s grade of C (“hold”). Lifeway Foods manufactures cultured, probiotic food products in the health food industry. LWAY also rates an F in Portfolio Grader’s specific subcategory of Margin Growth. The stock price has fallen 9.8% over the past month, worse than the 5.7% increase the Nasdaq has seen over the same period of time. The stock currently has a trailing PE Ratio of 85. For more information, get Portfolio Grader’s complete analysis of LWAY stock.

Tyson Foods‘s (NYSE:TSN) rating weakens this week, dropping to a D versus last week’s C. Tyson Foods produces, distributes, and markets meats, prepared foods, and related products. The stock also rates an F in Earnings Growth. For a full analysis of TSN stock, visit Portfolio Grader.

This week, Darling International (NYSE:DAR) drops from a C to a D rating. Darling International recycles food and animal by-products, as well as provides grease trap services to restaurants and other food service establishments. The stock gets F’s in Earnings Momentum and Sales Growth. To get an in-depth look at DAR, get Portfolio Grader’s complete analysis of DAR 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.