Re: It is not portion size which matters
"Back in the 80s I used to take delight in taking visiting English pals for a sandwich in a New York diner... Next giggle was he look on their face when the sandwich arrived, it being about three times the size the guest was expecting... Next giggle was watching them tryy and pack away the whole thing"
This is part of the UK post war culture, that may go away in the current/next generations. When our parents and grandparents were younger, food was really scarce, you even had rationing. Food was never, ever, to go to waste. If you put it out to eat, you ate it.
Most of us, even now, still grow up with this mindset drilled into us, as a child you aren't allowed to leave the table until you've cleared your plate.
I believe in the US, you don't have this as much, and so find nothing too unusual in only eating part of a meal portion. For people in the UK, actually training yourself to be able to leave part of a meal and just bin it if you're full is difficult, but can be a big help.
I know someone who's diet is just to use a smaller plate, so she eats what everyone else does, and starts with a full plate and eats all of it, but has a lot less. She's lost a lot of weight with this so this might work, however it depends what's in the supermarket meal portions. I got some small portion "low fat" meals from the supermarket and whatever was in them, made me far hungrier after I'd finished it than when I started, I assume they pumped it full of something to replace the fat.