Nope I've never seen one of those but anything that helps you feel more in control of your eating is a good thing in my book. I do think everyone is a little different though and you have to find a balance that works for you. I try to have my plate 1/3 grains (pasta, rice, quinoa), 1/3 pulses/legumes (usually beans or lentils) and 1/3 veggies. I limit portion sizes with the grains, less strictly with the pulses and I usually add as many veggies as I feel like.