When American administration for food and medicine forbid selling ephedrine and their plant Ephedre, it was hard kick for companies who are dealing with selling supplements. In meanwhile, supplement manufacturers was looking for some alternatives. Several candidates appeared who are available and legal today in fat burning supplements. The most interesting is green tea.
Actually, it’s hard to find any fat burner who doesn’t contains green tea. Some studies showed that he has thermogenic effect independent of his coffeine component. Thermogenic effect means converting calories into heat.
The idea is with intensified thermogenic effect human’s burn more fat and keep muscles, witch is the main goal for weight-loss diets. Green tea also affect the activity of enzymes that digest fat. This causes the body retains less fat. Fats is the most concentrated source of calories (9 calories per gram, while protein and carbs 4 calories per gram), this means tremendous advantage. Active ingredients in green tea, commonly called polyphenols, are responsible for this effect.
Training, especially aerobic workout, offers it own thermogenic effects, witch in combination with green tea can significantly enhance the burning fat effect. Some newer research deals with this kind of problem. The research is done on special kind of laboratory mouses, which act like humans when they eat food rich with fats. Mice develop fat stores in the womb, just as in obese people. Just like people, mice have high level of glucose and insulin in steady state, what makes them a good model for studying the effects of obesity (related to diet) and diabetes. For purposes of this study, mice were divided into 5 following groups:
Mice on a diet with low fat percentage, without physical activity;
Mice on a diet with high fat percentage, without physical activity;
Mice on a diet with a high percentage of fat to whom was given the green tea extract, without physical activity;
Mice in a diet with a high percentage of fat, with increased physical activity;
Mice on a diet with a high percentage of fat to whom was given the green tea extract, with increased physical activity;
Physical activity included running on the treadmill for half an hour (you don’t expect, the mice to do squats, i guess). After 15 weeks, the mice dosed with only the extract of green tea there was a reduction in body weight by 47%, while that of those who underwent only physical activity, this reduction amounted to 24%. In a combination of green tea and exercise, this reduction was an incredible 89%. The green tea extract itself has led to a 58% reduction in fat, exercise has resulted in a 37% reduction in fats, while a combination of green tea and exercise has led to a reduction of 87%. The mice who were given the green tea extract burned more fats than the fourth group of mice. And while mice in the third group noticed increased fat oxidation only in the liver, in the fifth group of mice, oxidation was noticed in both liver and muscles. In mice in the fifth group, a decrease in blood glucose was also observed, which is an effect associated with increased insulin sensitivity. At the same time, only green tea or exercise alone reduced the level of insulin in the idle phase, which is stimulates more efficient use of fat as fuel. The positive effect of green tea on the oxidation of fat has become more evident in the further course of research, which means that this effect is a result of regular use and that it is not acute, as with medicines.
There are several theories about how the effect of green tea stimulates fat oxidation. One of them is the theory that green tea stimulates a specialized thermogenetic fat, which is known as brown fat. If that was the only effect, then he would be really disappointing, because people do not have much of this kind of tissue. On the other hand, green tea also blocks enzymes that reduce the activity of hormones that trigger a series of effects in the cell that result in oxidation of fat. Green tea also blocks enzymes that stop the effect of mobilizing fat that caffeine has. Accordingly, by its very option, supplements containing caffeine or green tea stimulate fat oxidation, which is an effect that could be activated in humans.