From my recent interviews with bookmark collector Lauren Roberts (still another interview; Lauren's site), I discovered this vintage War Food Administration bookmark showing the food groups in a round or plate format:
It's not the same as the new plate design, but I'm amused that literally everything comes 'round again. *wink*
On a related note, there's a contest to redesign the food label. They're asking for nutritionists and designers, but I think good old fashioned consumers ought to give it a go -- after all, that's who food labels are for!