Most people trying to lose weight have heard the recommendation to decrease their intake of high-carbohydrate foods, such as sugary foods, bread, cereal, pasta, etc., but a lot of people are not aware of why this recommendation is so critical to burning fat and losing weight. After all, even some doctors think that all calories are the same and the only thing necessary to lose weight is to eat fewer calories than you use up through exercise and daily activities. Due to certain hormones though, not all calories are handled the same way by the body, and the calories from carbohydrates are much more difficult to burn than the calories from other types of foods,and a high carbohydrate intake certainly makes one prone to storing fat and not burning it.

At the heart of the matter is the hormone insulin. The function of insulin is to stimulate the cells to take up sugar from the bloodstream (when blood sugar is high, as it typically is shortly after eating) and store it for reserve energy.

This extra blood sugar is first stored as a compound called glycogen in the muscles and liver. Glycogen can be quickly converted back to blood sugar when needed for energy to fuel sudden bursts of activity. The available storage space for glycogen is pretty limited, and when insulin has caused the glycogen storage to be filled up, the remaining excess blood sugar is stored as fat.

There is considerably more storage space in the body for fat than there is for glycogen. There are billions of fat cells in the body, each of which can enlarge to over 100 times it's original size to accomodate extra fat storage. As an aside, this is why it is possible to get fat again after liposuction - even if you remove many of the body's fat cells, those that remain can enlarge considerably to store fat.

Insulin is extremely powerful in its fat storage effects. In fact, not only does it stimulate fat storage, high levels of insulin block the effects of the body's fat burning mechanisms. It is for this reason that minimizing the intake of high-carb foods is so important.

High carbohydrate intake (and it really doesn't need to be very high) stimulates the release of large quantities of insulin. Large amounts of circulating insulin will strongly inhibit the body from being able to burn fat for a period of 1 to 2 days! To put it another way, simply eating about 20 to 25 grams of carbs at one time, which is about the amount of carbohydrate in just one piece of sliced bread, is enough to totally turn-off your body's ability to burn fat for up to 48 hours no matter what your diet is and no matter what you do for exercise during that period of time.

Some people mayhave doubts about that last statement as it is certainly possible to eat a lot of carbs and lose weight - for a while anyway. Notice that I said that high carbohydrate intake causes high insulin production that blocks FAT burning. It is still possible to eliminate retained water (which will produce weight loss), and it is still possible to burn calories, but the calories you do burn will not be from fat, they will be from glycogen and your lean body tissue, primarily your large muscles. As you may be aware, lean body tissue (muscle) is highly metabolically active, and if you burn that tissue, ultimately your metabolism will slow down, making it harder and harder to lose weight.

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