Federación Española de Enfermedades Metabólicas Hereditarias is organizing the #SinProChallenge, which was of great popularity las year. This year, over 40 participants will go low protein for a day and share their experience under hashtag #SinProChallenge #DiaMetabolico y #PkuDay. You are invited to follow and share their efforts and of course to encourage them. Here goes one of our promotional videos. Even some celebrities were also challenged to go low pro.