[vkazanov]

Yes! Cannot stress it enough. Move. It doesn't even have to be intense! Running can be traumatic. But calories don't care if it's a walk you're doing or a run.

Unless you have some fundamental food-related disorders it's not that hard. Our bodies were meant to gain weight weight quickly - and lose it if necessary. For most people losing 10-20 kg is a question of 3-4 months, or even less.