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Dietary carbohydrate digestion occurs mainly in the mouth and small intestine. During mastication (chewing) the salivary glands secrete the enzyme alpha-amylase which is referred to as ptyalin. Alpha-amylase briefly acts on dietary carbohydrates in the mouth to hydrolyze starch into simple sugars such as glucose. In fact, if you chew on a carbohydrate long enough you may taste sugar. This is a result of salivary amylase hydrolyzing the carbohydrate into a simpler sugar.

Mastication increases the surface area of the food for alpha-amylase to act upon. This allows the enzyme alpha-amylase to work more efficiently in carbohydrate digestion. However, the food does not remain in the mouth for a long time so only a small portion of starch is hydrolyzed there.

Once the chewed food has been swallowed into the stomach, carbohydrate digestion halts temporarily. This occurs because alpha-amylase is inactivated by the high acidic environment of the stomach. However, carbohydrate digestion will resume once the chyme (food mass and gastric juices of the stomach) enters the small intestine.

The acidic contents emptied into the small intestine are neutralized by bicarbonate secreted by the pancreas. The pancreas will then secrete alpha-amylase to continue carbohydrate digestion. Carbohydrate digestion is finished when the mucosal lining of the upper jejunum and duodenum absorb the bulk of the dietary sugars in the form of monosaccharides.

Now that we have a good understanding of what a carbohydrate is and the importance of the carbohydrate in the body, maybe an extreme low carb diet isn’t the answer for weight loss. Extreme diets whether they are low carb or high protein can put the body to the test. Carbohydrates may be a necessary evil, but the body relies heavily on carbohydrates for energy. Instead of testing one’s will power, using a weight loss supplement called a carb blocker may be a better option.

Carb blockers are a weight loss supplement recently introduced into the weight loss world. Carb blockers claim to block the enzyme alpha-amylase. If the enzyme alpha-amylase is blocked, then carbohydrate hydrolysis is affected. By blocking the enzyme, you block the breakdown of the carbohydrate which affects absorption of the monosaccharide. How so? If the carbohydrate is of complex origin, the enzyme must be secreted to break down the carbohydrate into a simpler form for absorption. In theory, the carb blocker should indeed help to block carbohydrates from being absorbed.

Phaseolus vulgaris is the active ingredient in carb blockers that comes from the white kidney bean. Phaseolus vulgaris interferes with the pancreas’ ability to secrete the enzyme alpha-amylase. Subsequent studies do prove that Phaseolus vulgaris does in fact inhibit the enzyme alpha-amylase.

Carb blockers are another option for weight loss. However, permanent weight loss requires you to make changes to your lifestyle. If you do not change your lifestyle then no matter what diet or supplement you choose, weight loss is temporary and short lived. This also means that if you choose a low carb diet, make sure that this diet can be done. Many people fail the low carb diets because of extreme commitments.


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