How much sugar is bad?

No, all sugar is not unhealthy.Fruits,honey and good quality branded jaggery is healthy if taken in moderate proportions.But always keep in mind that all type of sugar can increase weight, so the bottom line is bad quality sugar (that is mainly processed white sugar)should be replaced with above mentioned good quality sugars as far as possible.But if you are willing to decrease your body weight then you are to take even the good quality sugars in a moderate quantity only.