Kari Keaton is the sort of customer most businesses used to hate. The Rockville mother lingers at the grocery store, poring over ingredient labels. She calls food manufacturers and interrogates their customer service representatives about what sorts of foods get processed in the same facility and probes them on the meaning of "natural flavoring." And after all that effort, she still may not buy their product.
The way Keaton sees it, she has little choice. Her two sons, 10 and 15,...
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