I am one of the lucky 30 something bastids with lifestyle habits and work responsibiities that have kept me within 20 pounds of my true fighting weight since high school.
I looove to eat,no doubt about it, and eat well I do! But it is rare that you'll ever find me eating fastfood, except travelling when there is no other choice. A fair amount of redmeat ( madcow be damned!), rice, beans and sushi!
My recent move in 2003 to the heart of Sonoma County has meant that I also have found myself consuming far less brewskis in exchange for the (healthier?) lower cal red wines varietals that surround me now. That has meant an easy 10LBs reduction since September '03.
Along with all the other great insights thus far in this thread, I would include moderation as the key to all life's vices, including food and beverages.