I've learned that I have trouble saying no to left overs. So my solution has been to take and cook up big huge meals....yeah I know that seems the wrong thing to do......but I cook up huge meals and then I divide it all up into food saver bags to freeze. So that instead of having left overs in my fridge calling my name it's frozen in homemade portion controlled tv dinners. It keeps me from over eating and keeps the guess work out of measuring my food out every day.
This tip is of course for freezable items. Say your meat and cooked veggies. Example: Make a meatloaf and divide it up into serving sizes with your green beans and freeze, then add your salad after you heat the meatloaf and green beans.