I'm not talking about just cutting back on calories. I'm talking about the major calorie consumption scaleback advocated by groups like the Calorie Restriction Society (
http://www.calorierestriction.org/).
I read about the studies on mice, monkeys and humans in the NY Times over the last few years and decided to give it a try last April. These are the studies that have shown dramatic lifespan increases when calories were substantially cut. I've now dropped from 200 lbs to 167. I've been a little concerned that the weight is coming off a little too fast (about 3 or 4 pounds a week now). My goal weight is 155 (I'm a 5 foot 7, 39 year old man).
The idea is pretty simple - cut calorie consumption back substantially (I've cut mine to about 1500 calories a day) and eat food with lots of nutrients. I basically have been fasting during the day and having a healthy dinner. At first, I felt hungry, but I've actually gotten used to eating this way.
I also do about 30 minutes of stairs or swimming at the gym each day or walk four miles if the heat isn't too bad.
I like the simplicity of this. No weird foods. No real discipline when it comes to counting calories - basically a plate full of healthy foods at dinner. Maybe a low cal dessert afterwards. I thought this would be really hard, but it's not so bad. I have found that unlike before when I used to think about food all the time, I now only think about it once a day. If I feel a little hungry during the day, I just ignore it and after a few minutes, the hunger is gone.
I also thought my energy would be really low, but I seem to be functioning just fine.