You can loose all your extra weight in the kitchen. Nevertheless, doing a sport help, a lot. I lost 15kg just by changing my eating habits (over 3 years). But the last mile is really hard to get to without exercises. I'm a sailor, but i only get to windsurf/kayak/so catamaran during summer, where i loose ~5kg i immediatly gain over the autumn-winter period. Doing a new, indoor sport did help a lot. This year, even though i only started in February, i already have my weight of October (when i usually stop enjoying myself on the water)