What is the quickeest way to lose weight?

Diet AND exercise. Make sure you exercise at least 30 minutes a day, don't skip meals, avoid soda, juice, dairy, alcohol and fried foods. Eat a healthy well balanced diet! also water, organic vegetable broth, green leafy vegetables, natural pickles, apples are great to fill you up so you dont feel hungry and they are very low in calories.
Diet & exercise. I agree with Dr Baez. However remember there is no quick fix. Any fad diet will help you to lose weight but most are unhealthy and not something you can sustain for a long time. learn proper eating habits and always try to stay active.
Go smart not fast. Eat healthfully. Try to eat at least 5 servings of vegetables & 4 of fruit per day. Increase nutritional fiber. Avoid refined sugar & junk carbohydrates. Avoid alcohol, sweetened juices, soda & caffeinated beverages. Aim for 7.5 to 8 hrs of sleep / night. Hydrate w at least 64 oz of water / day. Calories burned must > calories consumed. Do both cardio & weight training.
HCG diet. Works wonders and you are not hungry while on it. But you need to see a qualified physician to properly administer it. The internet otc products are useless.