The key to how to naturally lose weight fast is knowing that it takes 3,500 calories to make a pound of weight, so it takes consuming 3,500 calories fewer (or burning 3,500 calories more) to lose a pound of weight.
That means if you burn 500 calories a day more than you have been, without any change in your diet, you'll lose a pound a week. If you combine being more active with cutting 500 calories of food a day, you'll lose two pounds a week.
Using the above guidelines and cutting out some of the high-calorie snacks and sodas you're eating now in favor of lower-calorie fruits and vegetables should make losing weight naturally and quickly easy for you.