Childhood obesity is on the rise in many countries and overuse of antibiotics is now on the radar as a possible factor in the epidemic. Here 18-month-old twins are weighed in a nutritionist's office in Colombia. Raul Arboleda/AFP/Getty Images hide caption

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Karlton Hill, 15, was diagnosed with diabetes when he was 12. He works hard to manage the disease: He jogs and does pushups every day; he takes metformin is very careful about what he eats. Leslie Capo/LSU Health Sciences Center hide caption

itoggle caption Leslie Capo/LSU Health Sciences Center

Moms and their kids protest a proposed ban on homemade food at bake sales in New York City schools at a rally near City Hall in 2010. One sign read, "I wanna get obese on my terms. No junk food." edenpictures/Flickr hide caption

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People stroll down a street in Montpelier, Vt., last summer. In 1995, 13.4 percent of Vermonters were considered obese. The figure climbed to 23.5 percent in 2011. The latest national data suggest the obesity epidemic has plateaued, however. Toby Talbot/AP hide caption

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Alexandria Johnson got involved with the Anderson Monarchs soccer team when her mother was looking for an affordable way to keep her active. Todd Vachon/WHYY hide caption

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Nathaniel Donaker, 4, eats Kellogg's Frosted Flakes cereal at his home in Palo Alto, Calif. Frosted Flakes is 27 percent sugar, according to a report by the Environmental Working Group. Paul Sakuma/AP hide caption

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Cory Booker is mayor of Newark, New Jersey and honorary vice-chair of the Partnership for a Healthier America. Doug Van Sant hide caption

itoggle caption Doug Van Sant

In the Packard Pediatric Weight Control Program, kids learn that some foods, like cookies, cupcakes and soda, are "red lights" and shouldn't be eaten frequently. iStockphoto.com hide caption

itoggle caption iStockphoto.com