The U.S. grocery slowdown is becoming harder to ignore. Shoppers are buying fewer items than a year ago, and grocery sales are declining as weakening unit sales are now outweighing rising prices. That is according to new analysis from Bain & Company using NielsenIQ grocery data shared exclusively with CNBC.Grocery units, which refer to individual items or products sold, fell 1.8% in June from a ye…

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