The biggest problem I have is when I am plating my food I am usually hungry so I pile on more than I should.
Then when I actually feel full I have food on my plate, good food... then I hear my father somewhere deep in the catacombs of my brain saying "Clean your plate there are starving children that would love to have that".
I feel so wasteful throwing food out it tends to get me and I finish it.
I have been working on keeping my initial portions to a minimum but although I am better, I still overeat.