I agree with jabber. Taking it from his perspective… “you weren’t on the diet so your disease isn’t a big deal, if it was you wouldn’t have been off your diet in the first place.” You can’t blame him for not understanding it or not being as concerned as you think he should be. You should sit down with him and explain what PKU is. I hate to say it, but people without PKU don’t have to do research. Honestly, it’s up to us to teach them because there is too much false info out there anyway.