Keeping intact a 2010 rewrite of a law that dictates what kids eat in school — from the number of carrots to the amount of salt in their shepherd’s pie — could be a major challenge as some in Congress are already angling for a rollback, writes Tarini Parti and Maggie Severns in Politico. Many of the changes included in the 2010 Healthy Hunger-Free Kids Act have yet to be implemented, and reauthorization of the law is more than a year away. But the food industry and school associations are already lobbying to eliminate key provisions that have been perpetually under contention, such as sodium limits and minimum fruit requirements.