One really easy thing to do. Get yourself a nice fiber supplement that is high in soluble fiber. I know it sounds too easy and your thinking you're going to crap like a horse, but it really does work.
The reason is that fiber is a leptin trigger.
Leptin is a hormone that is primarily secreted from the fat cells themselves, in response to the amount of triglycerides they stock. On a paracrine level they serve to signal neighbouring pre-adipocytes that the existing fat cells are full and that the pre-adipocytes need to proliferate and differentiate.
It does so via a specific leptin receptor that uses the same downstream signalling cascades as insulin, and results mostly in similar effects, namely the activation of cEBP alpha and PPARgamma, factors of proliferation and differentiation, causing an increase in the amount of fat cells.
Because leptin serves as a signal of excess, it fulfils many functions on an endocrine level that may be perceived as positive to fat loss, such as a reduction in appetite, diminished response to appetite inducing signals, and so forth. Mainly because of its many roles in this regard, it has been hyped as the next big factor in weight loss.
So in a simple nutshell. Becoming obese lowers leptin production. This decreases your body's natural ability to regulate fat stores. Fiber elevates leptin levels and your body realizes that fat cells are full. The result is that your metabolism jumps while at the same time your brain is telling your body that it doesn't need to eat so you don't get hungry. Once your body returns to a more healthy weight, it doesn't matter how much fiber you take, the leptin levels naturally drop again and your metabolism will stabilize to maintain that fat level.
I gained 80lbs in about 2 years eating at carl's junior most days and eating dinner at about 10pm most days. I actually couldn't sleep on an empty stomache. I kept track of calories for about a week and it turned out I was at about 4,000 per day. I love butterfingers! I tried to diet and lost about 15lbs but my cravings got the best of me and I gained it all back within a couple months.
I learned about leptin and fiber so I began taking "yerba prima" fiber powder with my normal drinks each day. I didn't intend to change my diet but after a few days of getting a good amount of fiber I was no longer very hungry and the though of a super sized double western burger wasn't very appealing anymore. In place of my 10pm meal I would simply mix up a big glass of juice with fiber and I would be stuffed.
I lost 5% body fat during the first few weeks and I'm on my way now to stabilizing back at 190lbs again. I'm 6' tall and when I work out, 190 is my stable weight. I should be at my ideal within the next month or so. 190lbs and about 9-10% body fat.