Portion sizes in restaurants these days tend to be ridiculously huge. Get in the habit of sharing meals with your spouse or partner or friends. You order an appetizer or salad. Your dining partner orders a main dish. You both get to enjoy everything, and in reasonable portions. And the minute you start to feel just a little bit full, put that fork down and take the leftovers home. Your stomach is actually one of your best friends when it comes to portion control.