Joi Ito has been posting on his dietary changes, and I found this interesting:
In addition to the change in the way things taste, my cravings and hunger have changed a lot. First of all, I don't feel hungry very much. I feel hungry when my body starts to run out of energy. Exercising accelerates my hunger. The hunger isn't so much a craving as a sort of "running out of batteries" feeling. It actually feels good because I feel like I'm cleansing my system... sort of like when you empty a glass of water. Although this may be my imagination, when I sit down to a meal after this sort of hunger, I can feel the point (about half-way through the meal) where the energy starts to flow into my system and I become more alert and energetic.
I changed my diet about 7 months ago, after my doctor read me the fairly terrible cholesterol and triglyceride levels in my blood. I also had a fairly nasty acid reflux problem - I was consuming a bottle of Tums Ultra per week.
I didn't go on any kind of organized diet - I just cut out the foods that were giving me acid reflux problems, and added in regular helpings of fruit and vegetables. Those (the bad foods) were the same ones that gave me bad numbers anyway, so it all worked out. Basically, I cut way, way back on bread, pasta, peanut butter, french fries... that kind of thing. The upshot - no more acid reflux, my numbers are great, and I've lost a bit over 20 pounds.
I don't miss any of the crap I used to eat, either. I'm not really sure why this was easy for me, and I know that this sort of dietary change isn't easy for everyone - but it's worked out quite nicely for me.