Slimming requires the adaptation of menus to the body's own condition and body fat status. Ideally, a diet plan should be created by a nutritionist. Dietitians are able to find out from research what causes excess weight. By finding out the problem, measures can be taken to help combat excess weight. Nevertheless, every diet has its common points. Certain foods are the strongest contributors to fat gain and we should avoid them. What should you eat when losing weight and what should you give up?