What's the fastest way to lose weight by adjusting diet?

Calorie reduction: If you reduce your daily calorie consumption by 500 (for a total of 3500 calories reduced in one week), you will lose one pound per week -- this is a healthy and sustainable way to lose weight -- good luck -- and don't forget to exercise!

Go slow: To lose weight insure that calories burned > calories consumed. Drink at least 8 - 8 oz glasses of water /day. Try for 8 hrs of sleep/night. Aim for at least 5 servings of vegetables & 4 of fruit per day. Use whole grains. Avoid sodas, alcohol & junk carbohydrates. Get in a good mix of aerobic & weight lifting exercises.