SpanishFly I have poor control over how much stuff I eat. My way of dealing with it is to change the type of food I eat, not how much of it I eat.
So now, I eat only whole foods that I prepare from scratch. Nothing processed - so no bread, pasta. No crisps, no bought cakes, biscuits, sweets or whatnot.
Instead I eat loads of vegetables (usually 7-10 portions a day), loads of oats, loads of pulses, nuts and seeds. Some fruit, dairy, rice, couscous, quinoa etc. And plenty of lean meat and eggs.
But... critically in relation to portion control in the context of this thread... I have as much as I damn well like.
I know I still have bigger portions than most other people would. But I don't care because while it's a massive portion, it's a massive portion of healthy food.
I know if I were to bake a cake, I could easily eat all of it. So I tend not to bake the cake and just shift my focus to healthy treats instead. Or if I do bake a cake I ensure the kids get their slice first. Because I know whatever left, I will eat it. But as long as I account for that in my overall weekly calorie deficit then it's not a problem.
I've managed to lose 7 1/2 stone in 9 months following this strategy. I feel fully liberated.