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We take a look at how Oklahoma City went from being one of the most overweight cities in the United States to one of the healthiest. Also, the booming economy in Brazil has brought wealth, but as waistlines expand, it's taking away health. Plus, the science behind taste and just how our brains are reacting to our food. Owen Thomas, the editor-in-chief of ReadWrite, a technology news and analysis website tells us how the boffins of Silicon Valley are finding high-tech solutions to weighty problems.