Commitment and dedication.
The big kick in the pants is when the registration expired on my car, and I had to start cycling daily to get to work and get around. I was so out of shape and heavy that it was very tough, but just adding exercise to my routine had me losing 20 pounds in about 2 months.
No joke. Just cycling 3-5 miles a day was the kickstart I needed.
Started counting calories, gave up all beverages besides water, and replaced calorie-dense foods with more fruits and vegetables. Low carb dieting IS NOT the answer. The bottom line is calories in vs. calories out.
I maintained this for a while, and in the first year, I went from 260 to 195. I "hit the wall" there, though, and when I met my girlfriend, I went a bit lax, and ended putting a small chunk back on.
Summertime last year, I was back around 220. Not acceptable. I was able to drive again, and was getting really bored with cycling alone, so I took up walking. I bought a pair of Vibram FiveFingers, and would routinely walk 5-10 miles every other day, and started counting calories again. That got me back down to 200, but I really wanted to hit my set goal of 175. At the rate I was going, it would have taken another 6 months or so. As you get lighter, it's harder to burn calories in mass.
I picked up a gym membership to start using their fancy elliptical machines. Murder on the knees, so I added glucosamine to my vitamin regimen. I worked myself up to burning 800-1k calories a day, and limited my intake to around 900 calories a day, essentially forcing my body to run on fat stores as opposed to consumed calories. This did the trick, burned off the last 25 pounds in about a month, month-and-a-half.
Now my metabolism is working properly, and I don't feel the need to eat often. If I do end up endulging on one given day, I will go through more than half of the next day without hunger. I'm not watching calories anymore, so to speak, but am listening to my body instead, something we forget to do today with our foods laced with sugars and chemicals.
I avoid boxed/processed foods, sticking to natural foods as much as possible. That doesn't stop me from having the occasional burger or stack of pancakes at Denny's though.
One thing to consider, most sudden hunger pangs are typically dehydration. Have a tall glass of water, and give it 15 minutes. It will likely subside. If not, have a light snack. I like a Fuji apple and a couple of mandarins.
Feel free to PM me for any advice.
You can do it!