I need to lose excess weight what diet is quickest?

Diet and exercise. The goal is to burn more calories than you consume. Watch your diet-eliminate junk food and don't over eat. Consider liquids as well-soda, alcohol, etc contains a lot of calories. Exercise multiple times a week. If you find an activity you really enjoy you'll be more likely to engage in that activity. Avoid fad diets that could prevent you from getting adequate nutrition. Make healthy choices!