Calorie Counter - Count the amount of calories you eat
Moderately active people need about 15 calories per pound to maintain the bodyweight and keep a healthy body.
If your calorie intake is higher then the amount of calories you burn off during a day you will start gaining weight. If it is the other way around you will start losing weight. It is that simple. To keep your existing weight you have to keep the balance between the calorie intake and physical activity. The basic nutritional needs are: 2.000 calories a day for women and 2.500 for men. People who have a more active lifestyle, pregnant and nursing women need more calories.