The fight against obesity and overweight often begins with the elimination of selected products or ingredients from the diet. In order to lose weight, many people choose to reduce the calorie content of the meals they eat. For this reason, fat, as the substance with the highest energy density (9kcal/gr), is eliminated first. Is this right? What is its role in the fight against obesity and is it really worth excluding it? This is explained by an expert in the "Learn about fats" campaign, Prof. Magdalena Olszanecka-Glinianowicz, MD, PhD.