I agree with the brushing teeth idea; it's helped me alot especially when going to a place I don't want to eat but know there will be food at. I also agree that many of the previous ideas work well too.
I wanted to add to the list that I make sure that the types of food are very filling. At NutritionData.com, there is lots of data on each food item that also includes Fullness Factor (a number from 1 to 5, I think). I have used this along with volumetrics information to help find the most filling, nutritious and lowest calorie foods I like.
Below is a paste from their summary:
NUTRITIONAL TARGET MAP™
The Nutritional Target Map™ allows you to see at a glance how foods line up with your nutritional and weight-management goals. The closer a food is to the right edge of the map, the more essential nutrients per calorie it contains. For a more nutritious diet, select foods that fall on the right half of the map.
The closer a food is to the top edge of the map, the more likely it is to fill you up with fewer calories. If you want to restrict your caloric intake without feeling hungry, choose foods from the top half of the map.
Foods that are close to the bottom edge are more calorie-dense. If you want to increase your calorie intake without getting too full, choose foods from the bottom half of the map.
Read More
http://nutritiondata.self.com/facts/...#ixzz1XHub4XuF