Just now I posted a comment about calorie restriction for weight reduction while replying to a comment. I think it will be useful for others who might not see that comment, hence posting the information below. Any questions are welcome. I am not an expert in it, but I will try to give answers based on my current knowledge. If I don't find answer, let's try to find out answers. But all the questions are welcome. Naidu sir had said once - "No question is a foolish question"
I have mainly reduced it by calorie restriction. It is such an interesting thing to know that our daily calorie requirement is 2000 KCal on an average and if we will create calorie deficit (for example taking only 800 KCal a day and in this way creating a deficit of 1200 KCal daily), body will use it's enegy stores, which are fats. When a deficit of 7000 KCal is created, 1 kg weight is reduced. So restricting the calories (not food) is the best way to reduce weight.
Science is about measurement, hence I make use of measurement as the biggest tool. I have brought kitchen weighing scale and I can precisely monitor the number of calories I am taking.
It is all game of calories as I understand it.
Exercise is important too but it is secondary to calorie restriction and I try to do it as per time and my mood. :P