Despite a worsening US economic outlook and the impact of the September 11 attacks on consumer confidence, shoppers continue to buy organic milk, veggie burgers and other health and wellness products at a rapid clip, market research firm SPINS reported today. In September 2001, nationwide sales of health and wellness products in conventional retail outlets grew 21.5 percent versus the same period a year ago, far outpacing the growth of the overall packaged goods industry.