Track your daily calories, a great way to loose weight. If you use CalorieDiary every day you will get a good understanding of how your calorie consumption works. Please note that CalorieDiary does not calculate what a meal contains of calories. You can find that here: http://www.matvaretabellen.no/?language=en
You add each meal / drink or snack, so you get immediately a list of how many calories you used today and how many you have left to not gain weight. You can also create reports for days, weeks, months and years if you want.