There are a number of theories on how to lose weight fast and burn stomach fat, but one thing is sure: there is no magic pill. There is always a price to pay for chemical methods of weight loss, so the natural methods are the best.

One thing to keep in mind is that nature is simple and logical, and that is as true of losing weight as it is of most other things natural. What that means is that if you use up more energy than take into your body then by definition, you must lose weight.

Why is that? It is quite simple and if you want to know how to lose weight fast then it is an easy equation to learn. Whether you want to burn stomach fat, lose belly fat or slim down your arms, consider this:

The food you eat contains energy - you are likely more familiar with the term 'calories', which is one way of measuring the energy content of your food. There are plenty calorie charts to be found online these days, so you should be able to work out the energy content of any food that you eat.

There are also charts available that offer the approximate energy expenditure of common methods of exercise: walking, jogging, housework and so on, and you can probably see where this is going now. By calculating the number of calories in the food you eat and comparing that with the calories consumption of the exercise you take you can work out whether you are likely to be losing weight or gaining it.

In fact, you should be able to work out much exercise you have to do to lose weight fast and burn stomach fat enough to make you look slimmer. It is a simple equation based on energy in Vs. energy out. If you consume more energy than you use up you will put on weight and if you use more than you eat then you will lose weight.

If you want to know how to lose weigh fast, balance the equation well on one side so that you use up many more calories than you are eating each day. You can also use the equation to target weight loss in specific areas of your body by focusing your exercise on these areas.

For example, if you want to burn stomach fat, first make sure you are using up more energy than you are eating, then focus your exercise on your stomach. By doing that you will preferentially convert your stomach fat into glucose and reduce the amount of fat in that region of your body.

When you exercise more than you eat what happens is that your body looks for a source of glucose. Energy is produced by a process known as cellular respiration involving oxygen and glucose. The glucose is normally available in your blood, since the carbohydrates you eat are converted into glucose by your biochemistry and then used as fuel to generate energy in the mitochondria of your body cells. These are small areas within each cell in your body that are used to generate area, just like a little battery.

If your blood runs out of sugar your biochemistry will look around for carbohydrates to convert into glucose, and the most convenient source your body fat. Your body will use up your fat, convert it to glucose and use that as fuel to generate energy. That is how to lose weight fast.

If you have no fat left your body then uses up your muscle protein: part of that can also be converted to glucose, which is why people look wasted when they have not eaten for a long time. The energy they need for their metabolism (their heartbeat, breathing, digestion, etc) comes from their muscle tissue, and once that has gone they will have no fuel left and will die.

However, you can use that to your advantage, and eat just a little less than you require for your daily needs, and you will lose body fat. Once you have reached your desired weight you can either cut back on your exercise or start to eat more in order to fine tune the balance between energy in and energy out.

That's how to calculate how to lose weight fast and burn stomach fat by balance diet with exercise and focusing that exercise on your stomach. It is a simple equation and it works