No matter how fat you think you are or how much weight you would like to lose, you cannot dabble when it comes to your daily calorie intake. In order to keep a balanced weight, the amount of calories you assimilate must equal the amount of calories you consume. The extra calories you take in are stored as fat and that's when you gain weight. An intake of about 2,000 calories per day has been chosen as reference. Every individual however has its own suitable calorie allowance to consider.
You must try not to go under your Basal Metabolic Rate. Your body needs a number of calories per day to keep your heart beating and keep you breathing. That's your BMR and it's usually calculated to be around 1,200 - 1,500 calories a day. Common daily activities like sitting, standing or talking are likely to increase the number of calories you use up. Make sure you find out the amount of calories you are burning each day, calculate your daily calories allowance and stick to it. It's best to try not to be over nor under your calorie allowance so you can be sure you maintain a balanced weight.