Largest retailer boosts organic market as nation tackles bulging waistlines For the organic grape tomatoes to land in Tara Smoot's shopping trolley required a tremendous act of will. First she renounced all junk food, banishing fried chicken and chocolate milk from her children's menu, and the pasta, crisps and sweets she and her husband had enjoyed. Then she prepared herself for a higher grocery bill. "It's a lot cheaper to eat unhealthily than healthily," she says. And there is temptation every step of the way. To reach the fresh produce section in this Wal-Mart super centre Ms Smoot had...