Mabela-- I have 2 tricks that really helps me from time to time... I luv to eat everything on my plate, so when I go out to dinner, I always ask for a doggy bag at the same time my meal arrives, then put half of it away immediately to take home for another meal and then eat up the rest of my plate.
Second thing I do: at home, when I cook a meal, I rarely use the dinner plates since I always feel like if I use one of the plates, then I need to pile more food on it
Which of course, wrecks my attempt to lose weight then lol.
What I do instead, in order to keep my food portions reasonable-- I get the appetizer dish and bowl and eat my meals outta there. Great way to keep your calories in check and you can psychologically feel like you're not missing much sometimes because you've "filled up" your plate
Hope this helps!