i'm guessing PP works but I know nothing about it and this has always worked for me, so why change habits haha!
Simply science, if you follow it it works...if not, well there you go :)
Yesterday was;
Porridge - 3
Cereal bar - 1.5
Banana - 1
Salad and dressing - 0
Popcorn - 1
Jelly - 0...