Time for coffee and tea
Green tea and reducing weight loss
There are many health benefits to drinking tea, this is mainly because of the antioxidant properties of polyphenols, such as theaflavins and catechins, that they contain.
Recently research has shown that components of tea may be involved in the control of obesity. This may have major implications as obesity is becoming a major problem in the 21st century. Indeed being overweight is linked with many conditions such as cardiovascular diseases and type II diabetes, and is known to decreases life span.
In addition to health impacts, increasing levels of obesity are likely to lead to major economic problems; it is thought that if rises in obesity continue at the same rate in the USA that the health system will be crippled by the next generation. Additionally the next generation of Americans are likely to be the first with a lower life span than their parents. The finding that green tea may contain components that help to prevent weight gain has created much excitement in the tea research circles.
Research by Rudelle and colleagues has shown that by drinking a solution of green tea, calcium and caffeine leads to an increase in energy expenditure of 4.6% in a 24 hour period. This level of increased energy expenditure is thought to be enough to control of weight gain. It is not yet known which is the key component involved in increasing the energy expenditure or if all three are required, but what is known is that catechins found in green tea are able to reduce the levels of LDL-cholesterols and triglycerides in the body. Strongly suggesting that drinking green tea is likely to have a very positive role in the fight against obesity.
In mice injection of EGCG (the main polyphenol in green tea) has shown to reduce their body weight dramatically after as little as two days. At the molecular levels consumption of catechins leads to increased energy expenditure in mitochondria and reduction in the expression of the fatty acid synthase enzyme. Furthermore, studies have shown that catechins are able to lower the levels of weight gain when animals are given a high fat diet.
Although much research is yet to be done in humans, it seems that extracts found in green tea such as caffeine and catechins are able to promote the thermogenesis of the body, to lower the levels of fats and carbohydrates and to suppress the appetite. Taking together it is thought that drinking tea may help to control weight gain and decrease the risk of becoming obese.References