When can you talk about overweight?

People are considered “overweight” when they have a Body Mass Index between 25 and 30, in particular when it is proved that the IMC is due to an excess of Body Fat. It may happen that an athlete have a BMI above 25, but because very muscular: in this case we are not talking of overweight. Overweight people with a good nutritional balance are not running severe risk for the health, but must pay attention to lifestyle because they have greater risk of developing obesity, much more serious condition as it is correlated with many chronic diseases.