How about nine years? 2007-03-28: 192lb; 2016-04-30: 153lb. I hit 160lb in late September of 2007 and haven't been above it since, typically fluctuating these days between 150-155lb. I did it by simply eating less and paying more attention to hunger signals. If you want to be sure you're not overeating, track calories in and your weight using something like MyFitnessPal. Weight loss is possible; CICO overrides everything.
Scale and app. It's never been easier.
Side note: it makes me very sad and disappointed to see comments like this downvoted. Do we not claim to value rationalism and the scientific method here? Take the challenge: weigh your food and yourself and log it, and see if you can disprove CICO. If you can, there's a Nobel prize in physics awaiting you!