Here's today's random question: Does Nutrisystem really work? Perhaps a better question would be: does any diet plan really work? The answer is 'Yes' if you stick to it like glue. The answer is 'No' if you're not prepared to stay on it for the rest of your life.
Seems to me that most diet plans only work well for the time you're on them. Once you come off them, you're on your own, and unless you've made progress in training yourself not to eat the way you did before, you'll go back to where you started.
The old issue of willpower is the problem; very few of us have enough willpower to completely change our lifestyles, even though that lifestyle may be threatening our life. I remember our pastor quoting some stats in church that the majority of people who had heart attacks went back to the kind of lifestyle they'd had before even though that could cause them to have problems again.
Human beings are notoriously difficult to change, and it's even more difficult for us to change ourselves. (Which is, of course, why we need God to work on us - but that's another story.)
Anyway, for something a bit more cheerful than diets...try this joke that @Liturgy tweeted on Twitter...
They canned the Twitter movie. Test audiences found it too hard to keep track of all 140 characters.