It's hard to lose weight ... darn hard. Yet even though the results are so rewarding, people often slip back into their bad habits and put the weight back on.

The world's most famous yo-yo dieter, Queen Oprah, is dealing with that weight gain right now. I've been in her shoes -- not the shoes I'd like to be in, the designer shoes that likely cost more than my monthly mortgage payment -- but the ones where she's looking down at the scale, shaking her head in dismay. Oh yeah, I've been there.

But here's the thing: According to Bob Greene, Oprah's trainer, try, try again may be exactly what dieters need to lose weight. Just like smokers often have to try to quit several times before they succeed, researchers suggest that some people may need to take more than one stab at dieting before they lose the weight for good.

Now, if it's your first time trying to lose weight, that's no excuse to throw in the towel. Not everyone will yo-yo, of course. But if you have lost weight and gained it back, Bob's saying that you shouldn't let that stop you from trying again. And again. And again. Because eventually, you'll get it right, and success will feel sooo good.