On Thursday, U.S. regulator dished out relaxed school meal rules designed to combat childhood obesity by limiting in calories and portion sizes. The move made permanent temporary rules changes adopted two years ago.Before the decision, USDA lifted its strict limitations on caloric intake of grains and starches, as well as protein, but only for the 2012-2013 school year. The move gave significantly more flexibility to schools and students, especially athletes.The healthy lunch rules had initially been adopted in 2012 as part of a law designed to improve school breakfasts and lunches, called the Healthy Hunger-Free Kids Act of 2010.