Eat less food and feel less hungry for up to eight hours - that's the claim of this little container of liquid called "Slim Shots."

The makers say it'll make you leave up to a third of your food on your plate.

But what's in it? And does it really work?

The product is made in Sweden, and you're supposed to drink one dose or mix it in your food, every day with breakfast. According to the marketing material, it starts working the first day you take it.

Each tiny container holds about two teaspoons of a vanilla-flavored emulsion of what the manufactures says are natural active ingredients.

A closer look at the company's web site reveals those active ingredients are water and fat - oat oil and palm oil.

Each shot contains 20 calories. A 30-day supply costs $40. A spokesman for Good Housekeeping said at that rate, your wallet may get thinner before you do.

"A short-term clinical study found that some people ate up to 30 percent less within 4 to 8 hours compared to when they didn't take the Slim Shots," said Good Housekeeping Nutrition Director Samantha Cassetty.

According to Slim Shots' website, participants in short-term clinical studies ate significantly less food after taking the mixture.

A closer inspection of the packaging discloses the intake reduction was actually a wide range - as low as 12 1/2 percent to as much as 30 percent.

"But these are only short-term studies and they don't show that people actually lost weight. They only show that they ate less," Cassetty said.

She added Slim Shots probably will not help emotional or compulsive eaters.

And even the manufacturer stresses portion control, counting calories and exercising at least three times a week to maximize your weight loss results.

Since it's a dietary supplement, Slim Shots is not tested, approved or even regulated by the Food and Drug Administration.

Good Housekeeping says if you're really serious about losing weight you can take the product in tandem with a diet and exercise program.

But even the manufacturer says before you take the appetite controller, you should consult your doctor.

Are there any people who should not take this stuff?

Actually there may be. It is sweetened with aspartame, and some people have a rare metabolic disorder that requires them to limit their aspartame intake in all products.

In people with Phenylketonuria, excessive consumption can trigger adverse reactions, including hyperactivity and irreversible brain damage.

So again, before you take any dietary supplement, consult with your physician.