I lost 75lbs in 7 months by doing two simple things- Portion control and Exercise. There's no way to get around it- exercise is the key, it helps your circulation, your oxygen intake, and it burns calories in a healthy way. And by exercise I mean cardio- find something you like that involves running or jogging and do it for at least 5 hours a week (try to do it 6 days a week). Your body doesn't start burning calories from exercise until about 20-30 minutes into that exercise- so make sure you have enough time to run or jog for about an hour. My personal pleasure is basketball. Eat what you normally would (unless you have health problems in which case see a nutritionist) but you have to make sure to get in the routine of eating less. When I was 255lbs, I would eat 6-8 slices of pizza in a sitting- that's just not healthy whichever way you look at it. So what I did was I started to eat until I was half full, and I ate slowly- instead of eating a pie, I'd have two slices and I'd go play some basketball.
Another helpful tip, eat your biggest meal of the day in the morning- I would wake up and make myself eggs, toast with juice and a bowl of fruit on the side. This way you're energized in the morning, and as you go about your day you'll burn those calories naturally.
The key to the whole thing was I bought a digital scale. And every night I would weigh myself before I went to sleep. It took about a week of doing all the above, but then I started to see results. Pound by pound I was getting somewhere, and the ability to see it happening motivated me to keep it up. You have to get into a routine, however you choose to lose- and that will take about a week to 2 weeks of consistently staying in your routine before it just becomes a natural part of how you live. Let me tell you, losing all that weight was the greatest accomplishment of my life- if my lazy ass can do it, anyone can.
Now back to your regularly scheduled programming.