Portion sizes are a huge factor. My wife tried a few new recipes this week. All of them said they serve 4. We are a household of two adults and one almost adult and didn't eat half of what she prepared (they all tasted great).

That said, I'm 30 lbs heavier than I was a decade ago. I know WHAT I need to do (exercise more, drink less), it's just been hard to get back into better habits.