Voluntary action by industry to support the public to make healthier choices (reformulation, nutrition labelling) has not had the desired impact on dietary shift.
Nid yw camau gweithredu gwirfoddol gan y diwydiant i helpu'r cyhoedd i wneud dewisiadau iachach (er enghraifft, ailfformiwleiddio, labelu maeth) wedi cael yr effaith a ddymunir ar newid deietegol.