Thursday, November 22, 2012

Green Tea: Weight Loss Potential? - Ecademy

We see Green Tea touted as a potential drink or ingredient for weight loss. But does it hold any water?

It seems that bioactive ingredients of Green Tea, polyphenols called catechins ((-)-epicatechin), are the functional component and scientists are backing up what the Chinese, Indians & Japanese have been saying for quite a long time, namely, that Green Tea has thermogenic properties and promotes fat burning.

Thermogenesis, or fat burning, is the process by which the body promotes energy expenditure. Most food has thermogenic effect as the body uses energy for processing food, but not all foods have the same thermogenic effect. Compare Protein to Fat and Carbohydrates for instance. Increasing thermogenesis, can increase energy expenditure and fat may well be used as energy.

At InnOrbit we support the theory that a balanced and healthy lifestyle works and not one thing alone is going to help with Weight Loss (Remember the magic bullet article). Other foods will help too and we have seen how herbs and spices can help with controlling weight via appetite and satiety. At the end of the day the maxim "do more and eat less" is probably going to work for you, so, drink tea as part of a wider healthy lifestyle to get or stay Slim and Fit.

"Tools for obesity management, including consumption of various plant materials, have been proposed as strategies for weight loss and weight maintenance, as they may increase energy expenditure (4-5%), fat oxidation (10-16%) and have been proposed to counteract the decrease in metabolic rate that is present during weight loss. Daily increases in thermogenesis of approximately 300-400 kJ can eventually lead to substantial weight loss. However, it becomes clearer that certain conditions have to be met before thermogenic ingredients yield an effect, as intra-variability with respect to body weight regulation has been shown between subjects. Furthermore, the sympathetic nervous system is involved in the regulation of lipolysis, and the sympathetic innervation of white adipose tissue may have an important role in the regulation of total body fat in general. Taken together, these functional ingredients have the potential to produce significant effects on metabolic targets such as satiety, thermogenesis and fat oxidation. A significant clinical outcome may sometimes appear straightforward and may also depend very strongly on full compliance of subjects. Nevertheless, thermogenic ingredients may be considered as functional agents that could help in preventing a positive energy balance and obesity." Hursel et al (International Journal of Obesity).

The recent Studies & Evidence:

Weight Loss Studies: 1

A study by Nagao et al (American Journal of Clinical Nutrition) on 2 groups of males with similar metabolic rates and waist circumference were given green tea in various formats. Body weight, Body/Mass Index, waist circumference, body fat mass, and subcutaneous fat area were shown to be significantly lower in the green tea extract group than in the control group. The study suggests that daily consumption of tea reduced body fat which suggests that the ingestion of catechins might be useful in the prevention and improvement of lifestyle-related diseases such as obesity. Nagao and his team, in a separate investigation, also suggest that Green Tea ingestion contributes to a decrease in obesity and cardiovascular risks.

Weight Loss Studies: 2

Relative to a placebo, treatment with the green tea extract resulted in a significant increase in 24-h energy expenditure and a significant decrease in Respiratory Quotient. Treatment with caffeine in amounts equivalent to those found in the green tea extract had no effect on these parameters. The researchers, Dulloo et al, suggest that Green Tea has thermogenic properties and promotes fat oxidation and could play a role in the control of body composition via sympathetic activation of thermogenesis and fat oxidation.

Weight Loss Studies: 3

A study by Auvichayapat et al was performed to investigate the effects of green tea on weight reduction in obese Thais. The study suggests that Green Tea can reduce body weight in obese subjects by increasing energy expenditure and fat oxidation. This would also support a later study by Shen et al that GreenTea?polyphenols decreased fat percentage and increase bone mineral density and strength. The data suggests that Green Tea polyphenols benefit body composition and bone properties in in an animal model system thus enhancing antioxidant capacity and suppressing inflammation.


Source & Inspiration for Article: Green Tea for Weight Loss

Source: http://www.ecademy.com/node.php?id=182156

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