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those with special dietary needs are growing desperate. 8-year-old izzy bradford is a bundle from injure but suffers from pku. she relies on special formula for about 70% of her nutrition. >> the can you shake it? mm-hmm. >> reporter: what would happen to izzy's body if she didn't have this metabolic formula? >> she would start to break down psychologically, emotionally and physically. it is 70 portion of her nutrition. >> reporter: could it damage her brain. >> it would, long term not having the formula would result in permanent brain damage. >> reporter: about 17,000 americans suffer from pku, one of many metabolic disorders requiring specialized formula for life. how many cans arrived in your last order. >> two cans. >> reporter: how many were supposed to arrive? >> 16. >> reporter: pediatrician dr. paul levy fears if more patrons run dry, treatment will be limited. >> it's going to be a big problem. even if they get sick and we admit them to the hospital, the tools we use are based on the