To lose weight you should consume less calories than required by your body, taking into consideration the calories you burn in physical activities. Then only weight loss will result. Without this no diet will help you. However if you eat negative calorie foods your body will need extra calories to digest them, helping you to lose weight. Do you want to calculate how much calories do you actually need.
You can make a rough estimate by the following calculator. However, the actual calories needed to maintain weight may vary based on muscle mass, activity and a variety of other factors such as illness.