Running on the treadmill is great, but for best weight loss you need a variety of exercise, and most importantly, proper nutrition. An effective weight loss program would include varying types of cardio (some long, slow sessions, some short, fast sessions, some intervals), as well as strength training. Still, proper nutrition is paramount. Are you eating white pasta? White pasta is not a god choice. The whites (white bread, pasta, rice, etc) react the same way in the body as sugar. The liver is mor elikely to store them as fat if not used quickly. Let me know if I can help.
Sarah