I have tried many programs for diet, I lose 7kg since one year, but since that time I did not loose any killo more! So what should I do?

Weight? To lose weight, you must eat and exercise. Weight loss is 70% diet. What most do is eat less. Yes, they lose weight but it's all muscle they are losing. The idea is you want to retain muscle and lose fat. Yes? That will take a great committment. Create a diet with 60 % protein, 25% carbs (most of those being fiber) and 15% fats (healthy fats). Eat a meal every 3 hours to keep metabolism up.