It's a basic principle of weight loss.
Every item of food you put in your mouth contains calories. If you burn more calories than you consume, you will lose weight.
Some foods, like a piece of chocolate cake slathered with chocolate icing, are high in calories, and take a while to burn off. Other foods, like lettuce, are low in calories, and can be burned off faster.
Your body is always burning calories, even if you're sitting still and doing nothing. But being physically active helps you burn calories faster.
So, what are the foods that burn fat fast?
Catabolic foods burn more calories than they contain. For example, an apple contains around 80 or 90 calories. But the energy your body uses to metabolize the apple burns about 180 calories. So, when you eat an apple, your body burns off up to 100 calories more than you consumed.
Sounds pretty good, does not it?
Here is a list of high catabolic foods.
Now, this does not mean you can eat a slice of chocolate cake, and then eat five apples to make up for it. What it does mean is, if you are on a diet, eating certain foods will help you burn calories and lose weight faster. These are also foods you can snack on through the day, satisfying your hunger without worrying about ruining your diet.