Scientists recently made a discovery they think could put an end to obesity: A substance containing olive oil that can help keep you full for 12 hours. Sure, it's not available yet, but this isn't exactly rocket science -- you can find foods that have a similar effect on your hunger pangs at the local grocery store. The key is choosing foods that will fill you up. Here are some items to try:

• Fiber is filling because it takes longer to digest. Go for things like whole grains and legumes to get your fiber fill.
• Protein is the best fill-you-up food there is -- just make sure it's of the lean variety. Think low-fat cheese, lean poultry or fish.
• Wet foods are more filling than dry ones simply because they trick the brain into thinking they have more calories. Choose oatmeal over a cereal bar, and start with vegetable soup over a bread basket.
• Fill up on foods that have a low energy density, like fruits and veggies. Think about it this way: For the same amount of calories, you could have one slice of pizza or five oranges. Which one is going to leave you full?
• Water. OK, water is not going to keep you satisfied for hours, but it can quiet minor hunger pangs if you drink enough of it. Trust me -- if you get yourself hydrated, you'll notice you're eating less.

As for foods that won't fill you up? Whether real or fake, sweet things top the list -- even diet soda can leave you feeling hungry.

Capitalizing on New Year's weight loss resolutions, Weight Watchers recently unveiled their newest weight loss plan: Momentum.

Momentum marries Weight Watcher's popular Core plan, which lets you eat as much food as you want off lists of filling but low-cal foods, and their Flex plan, which gives each food a point value. The new plan focuses on "filling foods" that will help you feel satisfied and resist temptation.

Momentum curiously doesn't depend much on protein to keep a dieter full, requiring only one to two servings a day, and instead seems to be depending more on volume and fiber. I don't know about you, but protein keeps me full longer than just about anything else.

Weight Watchers never worked for me, but if you need help with portion control and food choices, it is a solid program. What do you think about their new program?

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