#1: Eating "low-fat"
It sounds crazy, but stop buying foods marketed as low-fat or fat-free. Typically, they save you only a few calories and, in doing so, they replace harmless fats with low-performing carbohydrates that digest quickly—causing a sugar rush and, immediately afterward, rebound hunger. Researchers from the University of Alabama at Birmingham found that meals that limited carbohydrates to 43 percent were more filling and had a milder effect on blood sugar than meals with 55 percent carbohydrates. That means you’ll store less body fat and be less likely to eat more later.