In order to make things clearer It is important to differentiate between the weight you desire and your ideal weight. It is important to make this distinction because ignoring it can lead to eating disorders and other types of illnesses.
So, ideal(optimal) weight is the weight in which your body feels most comfortable performing tasks and living in general. So with this in mind, you should avoid losing too much weight as it can lead to general loss of health. On the other side, eating too much and being over-weight can lead to many disorders involving the cardiovascular system, diabetes etc.
This new charts which was created by professionals in this field offers a new view on ideal body weight and takes into account all parameters. It also does not promote any unhealthy lifestyle choices.