For those of you who think ohhhh well my diets not that important your wrong. I have seen the damaging effects of untreated Pku. Never ever think that your diets not important its the most important thing in your life. Spikes are just as bad as high levels. As toddlers my sister"s diet and as well as mine were not properly taken care of. I have bad short term memory. My sister has some mental retardation and bad ADHD. I feel bad for her because it wasn't her fault that our diet was mistreated. I am glad our diet has been under control for 6 years. So please take care of your diet it really important what the doctors say is really true.