Calories are going to count when you are trying to gain weight. If you have trouble gaining weight you want to eat more calories so your body will store more on your body. If you are having trouble gaining weight, find foods that are good for your body that are low in fat, but that are high in calories. When you want to gain weight try adding muscle building exercises to your plan and then add the calories to your diet. Eating additional calories without exercising a little bit could just build fat storage on your body which may not be the over all look you want to achieve.
Calories are going to count when you want to lose weight as well. If you are overweight, or if you just want to redefine the shape that you have, cutting a few calories and exercising is going to help you shed those calories and the fat that is stored in your body.
Calories count for just about every thing you want to change about your body. If you need to learn more about counting calories, use the calorie counter to learn more about how much you are eating, and the calories that are contained in those foods. A big thing that one also needs to think about when counting calories is the portion of food you are eating. The portions of food should be small, controlled portions.
You can find out how many calories are in the foods you are eating by looking at the labels on the foods you are purchasing. Be sure to look on the labels of the frozen foods, the boxed foods and the canned goods you are purchasing. If you are purchasing fresh fruits and vegetables or meats, you can use the online calorie counters to show you what the calories are in those foods.