The U.S. recession is taking a bite out of national brand loyalty in products ranging from Advil pain reliever and Green Giant frozen vegetables to Jif peanut butter, according to a study released on Monday.  Just four out of 10 brands held on to at least half of their highly loyal customers from 2007 to 2008, according to the study from Catalina Marketing Corp's [CHKHDC.UL] Pointer Media Network, which gathers purchasing data at 23,000 stores nationwide.
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