NEW YORK (TheStreet) -- Gruma SAB (GMK), Cervezas (CCU), Anheuser-Busch (BUD), Concha y Toro Winery (VCO), Panasonic (PC), Unilever (UL) and Sony (SNE) are stocks that could add weight to portfolios in the present uncertain market conditions.The U.S. debt ceiling concerns have pushed the S&P 500 to one-month lows. The index stocks corrected 3% in the past week on the risk of a default if the debt ceiling is not raised. In this scenario, stocks that are relatively less volatile could balance a portfolio. We have selected companies that seem less volatile and could help cut losses in the event of a further downside. These stocks carry an average monthly beta of 0.74 and have an upside of 28% over the next one year. Besides, they carry a mean buy rating of 52%. The stocks are stacked by upside, great to greatest. >> Keep the stock market at your fingertips with TheStreet's iPad app.