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.
If it were that simple, most people would be able to do it. The actual evidence shows it's far more complex than you think.
There's no cop out here. Many people's bodies simply refuse to burn fat until their metabolism has gone so low it has other dangerous health consequences.
Also, as for "move more", the evidence shows that people generally eat even more after exercise to compensate. Exercise is great for general health, but it's a terrible strategy for most people for losing weight. It simply backfires.
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.