I'm on a diet

I have gained 2 kilos in the last 2 months. Until now, even if I gained 2 or 3 kilos I could lose weight around 1 week. However the weight gained this time are still with me. When I found this matter I thought I got older. So I decided I go on a diet until I lose weight by 2 kilos. Today's dinner were vermicelli soup of 75 kcal and yoghurt with maple syrup.