“…Of the 23 intervention studies, 16 studies were conducted with adults [41][42][43][44]46,[48][49][50]52,53,56,[58][59][60][61] and 7 were conducted with children and adolescents [45,47,51,54,55,57,62]. The effect of the portion control plate was examined using 2D plate diagrams (n = 12) [44,49,50,52,53,[55][56][57][58][59][60]62] and using 3D portion plates (n = 11) [41][42][43][45][46][47][48]51,54,61]. An overview of eight types of portion control plates found in the grey literature is provided in Table 4.…”