A 2004 study that included 329 overweight people found that 38% of the subjects who practiced to control food portions over a two-year time span, lost 5% or more of body weight as compared to the 33% who did not manage portions and gained 5% or more. Most people do not realize how little food it takes to feel satisfied.
Notice the term satisfied, not full. Eating to fullness usually means you ate too much food, and that extra will only turn to fat inside the body. There are various ways in which managing portions benefits your weight loss efforts, and unlike the endless fad and commercial diets, it allows you to achieve permanent weight loss by making profound eating habit changes that can actually last.