Weight gain or weight loss.what happens in diabetes type 2 ?

Both: Usually weight gain as the Insulin is putting the sugar into the fat system. Weight loss can occur right before someone goes from Insulin resistance to diabetes type ii.

Either: Usually there is weight gain which predisposes one to get diabetes. If the diabetes is very poorly controlled, weight loss can occur because glucose (and therefore calories) are "wasted" in the urine. With treatment, either can occur depending on diet and medication.