Don’t feel bad, because your sister will realize someday just like I did that you were just looking out for her. My sister did get on my nerves alittle when I was younger but that was because I didn’t realize how important the diet was and thought my sister was totally overreacting about the diet. But I realize now she wasn’t overreacting at all. Does your sister have hyperphe? I was just wondering because I know that is a more mild type of PKU. For me and my sister we can’t have meat at all, or any dairy but we can have little grains like ceareal.