I am sorry to tell this Rao Ji,we should never distinguish or analyses any thing good or bad as one is good to one and the same is bad to another. The accepting and neglecting a thing should be decided only according to individual's health. By seeing many diabetic patients my friend's wife controlled her husband in his diets and makes him to take coffee with less sugar etc., unfortunately his sugar level comes down and he suffered a lot with spending sufficient money to hospital on his rescue.
In another case, a relative of mine took (he also a diabetic) sundals on an advice from a doctor but another doctor told him after some tests, he reached high protein level and so he advised some medicines to regulate protein level in his body.
In general nowadays a view is spreading widely that the four whites should not consume in his food style which are milk, rice,sugar and salt. This may be good to the diabetic or persons under any medication but generally we should not avoid wantonly without consulting his body condition otherwise he have to face panic. Nothing is bad in this world but avoidance should based on individuals condition.