Eat a lot without eating a lot.

 Sounds confusing, but it’s very easy: On the volumetrics plan, you look not just at the calorie content of foods but the size or volume of your meal ingredients as well. Part of the struggle that people have with “diets” is dealing with hunger. The focus on eating higher-volume, lower-calorie foods (read: lots of vegetables) gives you a satiety advantage as you feel like you are eating a lot volume-wise but you really aren’t calorie-wise.