What is the very effective way to loose weight naturally?

Dieting and exercise, haha. Plan out your meals and don't snack during the day. When you get hungry, do another activity that keeps your mind off eating. Make sure you're not starving yourself and have accounted for proper nutrients in your diet. If you are craving something sweet, have a non-fat yogurt or buy some fruit-flavored tea. Also, make sure you do a little bit of cardio work every day, and some form of weight lifting each week. Little by little, you should see results!