Is eating cornstarch plain with a spoon,bad for u and if so why do people crave it???

It is hard to understand such a fetish or practice since the trigger can differ from person to person. Nutritionally it has near the same effect as eating spoons full of sugar. The trigger for an individual can often be found working with a life-coach/therapist since it can represent a stress response. Learning how to manage stress in an alternate way may resolve the pattern.

Pica, craving for unusual foods may indicate iron deficiency. It would be prudent to consult your doctor. You may take oral iron supplements to correct your iron stores. Make sure to reduce your food intake to compensate for the calories you are getting from starch so that you do not gain weight. Wish you good health!