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Purity Products – Keep Belly Flat With Green Tea

19th February, 2011 - Posted by health news - No Comments

As green tea intake increases, the degree of body fat in men and women, whether expressed as percent body fat or the ratio of waist circumference to hip circumference, decreases. Green tea aids to the maintenance of healthy body weight in many ways.

One of the least appreciated properties of green tea is its ability to limit the absorption of the fat taken in from the diet. Green tea catechins (especially EGCG) interfere with the lipase (fat-digesting) enzymes in the stomach and small intestine. The resulting incomplete digestion of fats produces some lipid droplets that are not able to enter intestinal cells and that therefore remain unabsorbed. These effects have produced significant decreases in the absorption of dietary fats by rats consuming green tea. While it is not known how effective green tea is in blocking fat absorption in humans, any interference with the normally highly efficient digestion and absorption of dietary fats could figure prominently in any effort to manage weight effectively.

In addition to decreasing the efficiency of absorption of fatty acids from the diet, green tea catechins interfere with the production of fat for storage in adipose tissue depots. Green tea leaf extract rich in EGCG, as well as purified EGCG itself, reduces the activity of fatty acid synthase, the enzyme that controls how rapidly the body produces fat for storage. This effect is consistent with a body of literature reviewed recently in the journal Molecular Nutrition and Food Research that shows how EGCG inhibits new fat formation (“lipogenesis”) and fat storage within adipocytes. Tea helps to absorb less fat from the diet and can directly interfere with the storage of fat in adipocytes, a dual mechanism for supporting healthy body weight.

EGCG, the dominant green tea catechin, allures the body to change some of its ways of producing energy from glucose-burning to fat-burning. There are two different ways of doing this, and EGCG appears to do both. The first way, is if the amount of glucose available to tissues (especially the skeletal muscles) is reduced, then additional fat must be metabolized to carbon dioxide and water in order to satisfy energy needs. When there is a shorter supply of glucose, the liver is able to synthesize glucose from a wide array of precursors, such as amino acids that are released by muscle cells. The primary enzyme in this synthetic, gluconeogenic pathway, is phosphoenolpyruvate carboxykinase (PEPCK), which is inhibited by EGCG. The blockage of this enzyme reduces the formation rate of new glucose, requiring cells to switch to fat-burning for a source of energy.

In one example of interesting biochemical coordination, EGCG stimulates the conversion of fatty acids to energy. According to cell culture studies, EGCG, rather than glucose, is able to raise the rate of utilization of fatty acid breakdown products in order to produce energy. Since mice are often studied because they obtain energy similarly to the way humans do, they were used in a series of experiments. In these experiments, they responded to the addition of catechin-rich green tea extract to a high-fat diet but not fed catechins, even though they ate just as much. In a recent study of dietary supplementation, mice exercised with tea catechins forced skeletal muscles to move from using their glycogen reserves as sources of enery to increase their dependency on burning fats from adipose depots. Being that this move is very reproducible, the researchers are able to predict when it will happen. Phytonutrients – catechins – in green tea and green tea extract are so powerful, that they are able to recruit muscles to help stored fat get used up faster!

A shift from glucose-burning to fat-burning would be seen as an increase in heat production, or thermogenesis, in humans. In one example of the fat-burning, thermogenic effects of green tea catechins, 24 hour heat production was calculated in slender healthy to overweight young men during times at which they were in a state of rest and consumed identical diets; they did not consume caffeine-containing foods or beverages, but they did intake either a placebo, 150 mg of caffeine alone or 150 mg of caffeine plus 270 mg of EGCG and 105 mg of other mixed catechins. Researchers observed that the intake of placebo or 150 mg of supplemental caffeine during a 12 hour period did not affect the utilization of glucose or fat in order to supply energy. However, the consumption of green tea catechins during a 12 hour period increased total energy expenditure and heat production in the same-day 24 hour period. It was found that increased fat-burning and decreased use of glucose for fuel caused this energy usage.

Because under the conditions of this experiment all energy expenditure was essentially “resting” energy expenditure, the catechin-induced increase in resting energy expenditure reflects enhanced thermogenesis. That is, more heat production as a “byproduct” of energy production. Since increased heat production to satisfy the same energy demand means that the efficiency of energy production decreased, more stored energy needed to be “burned” – accelerating the rate at which energy stored in fat depots would become depleted. Of course, as stored fat becomes depleted, both body weight and fat depot size decrease. The increase in fat utilization in this experiment, which was minimized by keeping the subjects in a “resting” state, could result in the loss of one pound of excess body weight in 1 to 2 months and a loss of 6 to 12 pounds in a year. Consistent with this rough prediction, overweight adults consuming 270 mg of EGCG daily for 3 months experienced an average loss of 4.6% of total body weight, with an average decrease in waist circumference of 4.5%. This thermogenic effect of green tea catechins, when combined with a healthy diet and exercise, could be extremely beneficial for those looking to support weight management efforts.

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Beneficial results were also shown in a gold standard, randomized placebo-controlled clinical trial, which was published recently in the American Journal of Clinical Nutrition. During this study, healthy men added either 22 mg or 690 mg of catechins daily to their diets for a total of 12 weeks. The results of this experiment showed that the men who were consuming 690 mg of catechins every day had lost more weight, inches off their waist, total body and abdominal fat.

What about Abdominal fat and Stress?

A growing body of evidence indicates that in both men and women, stress and mood issues are associated with increased abdominal fat storage and a larger waistline. How is stress and belly fat connected? Stress can increase the secretion of a hormone called cortisol. This hormone increases the rate of fat accumulation by abdominal fat cells. Even among healthy individuals, repeated episodes of stress-related cortisol secretion is implicated in increased abdominal fat.

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What Can Green Tea Do About It?

Green tea contains an unusual amino acid called L-theanine, which comprises up to 2.5% of the total dry weight of unfermented green tea leaves. This amino acid is absorbed efficiently and is able to enter the brain from the bloodstream. While in the brain, L-theanine releases relaxing physiologic effects. In this process, L-theanine may act to reduce stress perceptions, which in turn could have beneficial effects on abdominal fat formation. In one example, mice that were fed L-theanine accumulated less abdominal fat formation, and gained less weight. Green tea and green tea extracts that contain L-theanine can add to the support of healthy weight maintenance by supporting the body’s stress response.