Wear one of those granny knickers/abdominal support things, that suck in your tummy and thighs. They suppress your appetite. When I wore one, I didn't eat all day and didn't even feel the slightest bit hungry. Had to force feed myself!
And try not to buy junky foods. Whenever I am at the shops and I go to buy them, I just think 'What a waste of money, I'd much rather buy some awesome steaks".
This really works for me, my house is totally junkfood free, and whenever I want to snack, I'm forced to eat an apple or banana, or nuts, even if I really just want salt and vinegar chips. And I'm so used to it now. I don't even want those foods.