Common nutrients that burn fat

It's something I hear all the time: "I'm eating less... I've lost weight... but I'm still so flabby! What went wrong?"

The short answer is nothing went "wrong."

If you eat less, you'll lose weight -- but if all you do is cut the number of calories, you'll shed those pounds without losing  fat. As a percentage of body weight, you might not even lose any fat at all.

It's enough to leave even a dedicated dieter so frustrated they're ready to call it quits.

Don't!

The secret to losing fat along with your extra weight is in making other changes to your habits along with eating less.

Start with exercise. A good diet means a good workout several times a week.

But don't forget good nutrition, too, including two key nutrients that can help enhance your body's natural ability for using and losing  fat on its own: vitamin D and calcium.

When most people hear of those two in the same sentence, they think of bone health. And it's true -- they're both essential to strong bone.

But they can also help your body use up fat.

In one new study, 52 overweight and obese adults were given either 600 mg of elemental calcium and 125 IU vitamin D3 a day or a placebo and put onto a low-calorie diet for 12 weeks.

By the end of the study, the patients in the two groups had lost the same amount of weight -- but with one key difference: The ones who got the real supplements were losing fat.

Overall, the patients who took placebos lost a little less than 4 pounds of fat. But those who took the supplements lost more than 6 pounds of fat -- an increase of 55 percent. Patients who took the supplements also lost more visceral fat -- specifically, the dangerous fat that's been linked to disease.

The downside to the study is that it used just 125 IU of vitamin D a day. It's unclear whether a higher dose would boost fat-burning even more, but it is clear that most people need a lot more than that -- up to 5,000 IUs a day.

Then, don't forget to work in some exercise to really boost your body's fat-burning potential.

And for one super-easy way to stay fit, keep reading.