This video does an excellent job to illustrate the concept of volumetric eating. Studies have shown that people tend to eat the same volume of food throughout the day, regardless of calorie intake. So, if you replace some of those higher calorie options (I'm looking at you, Fettuccine Alfredo) with vegetables, you're belly won't know the difference but the scale will.
Don't villainize fats and carbohydrates though. Our body needs them, and protein, every day. The trick is to be savvy about which carbs and fats you choose. Whole grains beat refined junk, plant based fats like avocado and nuts beat trans-fats and most saturated fats.
What did you think of the video?