I am plumy by nature and always have to control my weight.. if i put on 2-3 kg then i start to calculate calories i eat and spend. It works for me, psychologically it's not like a diet and much easier.
Recently i have found useful programs to count calories, its great help to me and hope will be of use to you too)
Here are some of such programs downloadsoftware4free.com/category/health-nutrition.html