It is very important to eat fewer calories than what you burn. If you do, you will lose weight. You don't have to exercise too much to lose weight. Most people gain weight because they eat too many calories. Your main goal should be to reduce the number of calories you eat. When you eat less, your metabolism will increase. This will cause you to burn more calories. You may not have to exercise as much as you thought to lose weight. It may be enough to make small changes in your diet. One way to reduce the amount of calories you eat is to count how many you are eating. Write down how many calories you are eating every day. You will also want to note how many you actually eat.